Original: $4.44
-65%$4.44
$1.55The Story
What Are Ketone Urine Test Strips and How Do They Help?
If you're managing diabetes or following a ketogenic diet, keeping track of your ketone levels matters. Ketone urine test strips like Ketostix Reagent Strips give you a quick, straightforward way to check for ketones in your urine at home — no clinic visit required. Each pack contains 50 single-use strips, making it easy to test regularly without running out quickly. At just £4.44, it's one of the most accessible monitoring tools available for everyday use.
Ketones are produced when your body breaks down fat for energy instead of glucose. In people with diabetes, elevated ketone levels can signal diabetic ketoacidosis (DKA), a potentially life-threatening condition that requires prompt medical attention. The NHS advises people with type 1 diabetes in particular to test for ketones when blood glucose is high or when they feel unwell. You can explore our full range of diabetes monitoring products to support your day-to-day management.
How Do Ketostix Reagent Strips Work?
The chemistry behind these strips is straightforward but clinically reliable. Each strip is impregnated with sodium nitroprusside (also called nitroferricyanide), a reagent that reacts specifically with acetoacetate — one of the three main ketone bodies produced during fat metabolism. When you dip the strip into urine, a colour change occurs if ketones are present. The darker the colour, the higher the ketone concentration.
- Dip the strip into a fresh urine sample for approximately two seconds
- Remove the strip and hold it horizontally to prevent mixing of reagents
- Wait exactly 15 seconds before reading the result
- Compare the colour on the pad to the reference chart printed on the bottle
- Results are graded as negative, trace, small, moderate, or large
It's worth noting that Ketostix strips detect acetoacetate but not beta-hydroxybutyrate, which is the predominant ketone body in DKA. This means a negative result does not entirely rule out ketosis in all circumstances. Always interpret results alongside your symptoms and blood glucose readings.
Who Should Use Ketostix Reagent Strips?
These strips are suitable for a range of people, though the clinical context differs depending on why you're testing. Anyone with diabetes should follow their healthcare team's guidance on when and how often to test for ketones.
- People with type 1 diabetes monitoring for diabetic ketoacidosis
- People with type 2 diabetes who have been advised to monitor ketones by their GP or diabetes nurse
- Individuals following a ketogenic or very low-carbohydrate diet who want to confirm nutritional ketosis
- Pregnant women with diabetes, under medical supervision
They are not intended as a replacement for blood ketone testing in high-risk situations. If you have type 1 diabetes and your blood glucose is above 14 mmol/L, the NHS recommends testing for ketones urgently.
How Do Ketostix Strips Compare to Blood Ketone Monitors?
| Feature | Ketostix Urine Strips | Blood Ketone Monitor |
|---|---|---|
| Method | Urine dip test | Fingerprick blood sample |
| Ketone detected | Acetoacetate | Beta-hydroxybutyrate |
| Cost per test | ~£0.09 per strip | ~£1.00–£2.00 per strip |
| Accuracy in DKA | Moderate | Higher (preferred clinically) |
| Ease of use | Very easy, no device needed | Requires monitor device |
How Should You Store Ketostix Strips and Are They Clinically Reliable?
Storage matters more than most people realise with reagent strips. Keep the bottle tightly closed, store below 30°C, and avoid exposure to moisture, direct sunlight, or heat. Never store strips in the bathroom or near a window. Once opened, use within the expiry date printed on the bottle — using expired strips can produce inaccurate results, which could be misleading in a clinical context.
As a diagnostic aid, ketone urine test strips are reliable when used correctly and within their shelf life. They are not a substitute for professional medical assessment. If you're also managing other aspects of your health, our vitamins and supplements range may support your overall wellbeing alongside your monitoring routine.
This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.
Ketostix Reagent Strips for Ketone Urinalysis - 50 Test Strips specifications
| Treatment category | Diabetes monitoring / Ketone urinalysis |
| Mechanism of action | Sodium nitroprusside reacts with acetoacetate in urine to produce a colour change indicating ketone concentration |
| Effective for | Detecting urinary ketones in diabetes management and ketogenic diet monitoring |
| Suitable for | Adults and children (under medical supervision); people with type 1 or type 2 diabetes; individuals on ketogenic diets |
| Active ingredient | Sodium nitroprusside (nitroferricyanide) |
| Pack size | 50 test strips |
| UK classification | General Sale / Medical Device |
| Preparation | Reagent-impregnated plastic strip |
| Route of administration | Urinalysis (urine dip test) |
Specifications of Ketostix Reagent Strips for Ketone Urinalysis - 50 Test Strips
What Are Ketostix Reagent Strips and What Are They Used For?
Ketostix Reagent Strips are single-use diagnostic test strips designed to detect the presence and approximate concentration of ketones in urine. They are used primarily by people with diabetes to screen for diabetic ketoacidosis (DKA), a serious complication that can develop when the body produces excess ketones. They are also used by people following ketogenic or very low-carbohydrate diets to confirm they have entered a state of nutritional ketosis.
The NHS recommends that people with type 1 diabetes test for ketones whenever their blood glucose is consistently elevated, when they feel unwell, or when they suspect DKA. Ketostix strips provide a rapid, non-invasive way to do this at home, giving you a result within 15 seconds of dipping the strip in urine.
What Do You Need to Know Before Using Ketostix Strips?
Before using these strips, it's important to be aware of certain situations where results may be unreliable or where additional medical advice is needed.
Do not use these strips if:
- The strips are past their expiry date
- The strips have been exposed to moisture, heat, or direct sunlight
- The colour on the unused strip has already changed from its original cream/off-white colour
- You are unsure how to interpret the results — seek advice from your pharmacist or GP first
Warnings and precautions:
- A moderate or large ketone result in a person with diabetes requires urgent medical attention — do not wait
- Urine ketone testing detects acetoacetate only, not beta-hydroxybutyrate; blood ketone testing may be more appropriate in high-risk situations
- Results may be affected by highly concentrated or very dilute urine samples
- Keep strips out of reach of children
- For external diagnostic use only — do not ingest
Medicines and substances that may affect results:
- Levodopa (used in Parkinson's disease) may cause false-positive results
- Large doses of ascorbic acid (vitamin C) may interfere with accuracy
- Mesna (used in chemotherapy) may produce atypical colour reactions
- Phenylketones and phthalein compounds may also affect readings
How Should You Use Ketostix Reagent Strips?
Using these strips correctly is essential for an accurate result. Follow these steps carefully each time you test.
- Wash and dry your hands thoroughly before handling the strips
- Remove one strip from the bottle and replace the cap immediately — moisture degrades unused strips
- Collect a fresh urine sample in a clean, dry container, or pass the strip briefly through the urine stream
- Dip the reagent end of the strip into the urine for approximately two seconds
- Remove the strip and hold it horizontally — do not shake or blot the strip
- Wait exactly 15 seconds
- Compare the colour of the reagent pad to the colour chart on the bottle label in good lighting
- Record your result and note the time and date
- Dispose of the used strip safely in household waste
| Indication | Age Group | Frequency | Action if Positive |
|---|---|---|---|
| Type 1 diabetes monitoring | Adults and children (supervised) | When blood glucose >14 mmol/L or feeling unwell | Seek urgent medical advice if moderate/large |
| Type 2 diabetes (as directed) | Adults | As advised by GP or diabetes nurse | Contact GP if unexpected positive result |
| Ketogenic diet monitoring | Adults | Daily or as preferred | Trace to small = nutritional ketosis confirmed |
What Are the Possible Side Effects of Ketostix Strips?
Ketostix strips are a diagnostic device rather than a medicine taken internally, so systemic side effects are not expected. However, a small number of users may notice the following.
Common:
- Mild skin irritation if the reagent contacts skin for a prolonged period
- Staining of fingers from the reagent pad
Less common / device-related issues:
- Inaccurate readings due to improper technique or storage
- Colour changes on unused strips indicating degradation
If you experience any unexpected skin reaction, rinse the affected area with water. If irritation persists, consult your pharmacist. You can also browse our electrical health and diagnostic range for additional monitoring tools that may complement your routine.
How Should You Store Ketostix Reagent Strips?
- Store at room temperature, below 30°C
- Keep away from direct sunlight, heat sources, and moisture
- Always replace the cap firmly after removing a strip
- Do not store in the bathroom or kitchen where humidity is high
- Do not remove the desiccant (silica gel) from the bottle
- Do not use strips after the expiry date printed on the bottle
- Keep out of reach and sight of children
- Do not freeze
If you're managing diabetes alongside other health concerns, our first aid collection includes a range of products to help you stay prepared at home.
References
- https://www.nhs.uk/conditions/diabetic-ketoacidosis/
- https://www.nhs.uk/conditions/type-1-diabetes/living-with-type-1-diabetes/monitoring-blood-glucose/
- https://www.nhs.uk/conditions/type-1-diabetes/
- https://www.nhs.uk/conditions/type-2-diabetes/
- https://www.nhs.uk/conditions/diabetes/
- https://bnf.nice.org.uk/treatment-summaries/diabetes-mellitus/
Written and reviewed by our qualified team
Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.
Frequently Asked Questions
Where can I buy ketone urine test strips online in the UK?
You can buy Ketostix Reagent Strips for Ketone Urinalysis directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.44 for 50 strips. No prescription is needed as these are available over the counter. They're dispatched quickly and discreetly to your door, making it easy to keep your supply topped up without visiting a pharmacy in person.
How do Ketostix reagent strips detect ketones in urine?
Ketostix strips contain sodium nitroprusside, a chemical reagent that reacts with acetoacetate — a ketone body produced when the body burns fat for fuel — to produce a visible colour change on the strip's reagent pad. The intensity of the colour corresponds to the concentration of ketones present, ranging from negative through to large. You simply compare the pad colour to the reference chart on the bottle to read your result.
How do I use Ketostix strips correctly step by step?
Remove one strip from the bottle and recap it immediately to protect the remaining strips from moisture. Dip the reagent end into a fresh urine sample for two seconds, then hold the strip horizontally and wait exactly 15 seconds before comparing the colour to the chart on the bottle. Read the result in good natural or artificial lighting for the most accurate interpretation.
What is the best time of day to test for ketones in urine?
The first morning urine sample is generally the most concentrated and therefore gives the most consistent ketone reading, which is why many people on ketogenic diets prefer to test first thing. However, if you have diabetes and feel unwell or your blood glucose is elevated, you should test immediately regardless of the time of day. Always follow the specific guidance given by your GP or diabetes care team.
Can Ketostix strips give a false positive or false negative result?
Yes, false readings are possible in certain circumstances. Expired or improperly stored strips, highly dilute urine, and certain medicines — including levodopa and high-dose vitamin C — can all affect the accuracy of the result. A false negative is also possible in early DKA because Ketostix detect acetoacetate but not beta-hydroxybutyrate, which is the predominant ketone in that condition. If you're concerned about your result, speak to your pharmacist or GP.
Who is eligible to use Ketostix ketone urine test strips?
Ketostix strips are suitable for adults and children (under appropriate supervision) who need to monitor urinary ketone levels. They are most commonly used by people with type 1 diabetes, people with type 2 diabetes as directed by their healthcare team, and adults following a ketogenic or very low-carbohydrate diet. Pregnant women with diabetes should only use them under medical supervision. You can browse our full diabetes monitoring range for additional tools to support your care.
What does a positive ketone result mean if I have diabetes?
A trace or small positive result may indicate that your body is beginning to use fat for energy, which can happen during illness or when insulin levels are low. A moderate or large result in someone with diabetes is a medical concern and may indicate diabetic ketoacidosis (DKA), which requires urgent medical attention — call 111 or go to A&E if you also feel unwell. Never ignore a high ketone reading if you have type 1 diabetes.
Are Ketostix strips suitable for monitoring a keto diet?
Yes, Ketostix strips are widely used by people following a ketogenic diet to confirm they have entered nutritional ketosis. A trace to small reading typically suggests the body is producing and excreting ketones, which is consistent with fat-burning. Keep in mind that urine ketone levels can fluctuate throughout the day and may decrease over time as the body becomes more efficient at using ketones, even if you remain in ketosis.
How do Ketostix urine strips compare to blood ketone monitors?
Ketostix urine strips are significantly cheaper per test and require no device, making them convenient for routine monitoring. Blood ketone monitors measure beta-hydroxybutyrate directly and are considered more clinically accurate, particularly in DKA screening. For everyday ketogenic diet tracking or low-risk monitoring, urine strips are a practical and cost-effective option; for high-risk diabetes situations, blood ketone testing is generally preferred by clinicians.
How long do Ketostix strips last once opened?
Once opened, Ketostix strips should be used before the expiry date printed on the bottle — opening the bottle does not reset this date. However, exposure to moisture, heat, or light after opening can degrade the strips faster than the printed date suggests. Always store the bottle with the cap tightly closed, away from humidity, and check that unused strips still show their original cream/off-white colour before use.
What should I do if my ketone reading is high?
If you have diabetes and your result shows moderate or large ketones, seek urgent medical advice — contact your GP, call NHS 111, or go to your nearest A&E, especially if you feel sick, are vomiting, or have abdominal pain. Do not wait to see if the reading improves on its own. If you are on a ketogenic diet and feel well, a high reading is less likely to be dangerous, but it's still worth discussing with a healthcare professional if you're unsure.
Can children use Ketostix ketone test strips?
Children with type 1 diabetes may need to use ketone test strips as part of their diabetes management plan, but this should always be done under the guidance of a paediatric diabetes team or GP. The strips themselves are safe for use in children when used correctly, but interpreting results and deciding on next steps should involve a healthcare professional. Keep the strips stored safely out of reach of young children when not in use.
Do any medicines interfere with Ketostix strip results?
Yes, certain medicines can affect the accuracy of Ketostix results. Levodopa (used for Parkinson's disease) is known to cause false-positive readings, while high doses of ascorbic acid (vitamin C) and mesna (used in chemotherapy) may also interfere. If you take any regular medicines, it's worth checking with your pharmacist whether they could affect your ketone test results. You can also explore our vitamins and supplements section if you're reviewing your supplement intake.
How should I store Ketostix strips to keep them accurate?
Store Ketostix strips at room temperature below 30°C, in their original bottle with the cap tightly closed after each use. Avoid storing them in the bathroom, near a window, or anywhere with high humidity or temperature fluctuations. Do not remove the desiccant from the bottle, and never freeze the strips. Proper storage is one of the most important factors in ensuring reliable results every time you test.
What are the latest research findings on urine ketone testing in diabetes?
Current clinical guidance, including NHS and NICE recommendations, continues to support urine ketone testing as a practical first-line screening tool for DKA in people with type 1 diabetes, particularly in community settings where blood ketone meters may not be immediately available. Research has increasingly highlighted that blood ketone testing (measuring beta-hydroxybutyrate) is more sensitive in early DKA, but urine strips remain a valuable, accessible option. Ongoing diabetes management guidelines recommend that all people with type 1 diabetes have access to ketone testing of some form.
Description
What Are Ketone Urine Test Strips and How Do They Help?
If you're managing diabetes or following a ketogenic diet, keeping track of your ketone levels matters. Ketone urine test strips like Ketostix Reagent Strips give you a quick, straightforward way to check for ketones in your urine at home — no clinic visit required. Each pack contains 50 single-use strips, making it easy to test regularly without running out quickly. At just £4.44, it's one of the most accessible monitoring tools available for everyday use.
Ketones are produced when your body breaks down fat for energy instead of glucose. In people with diabetes, elevated ketone levels can signal diabetic ketoacidosis (DKA), a potentially life-threatening condition that requires prompt medical attention. The NHS advises people with type 1 diabetes in particular to test for ketones when blood glucose is high or when they feel unwell. You can explore our full range of diabetes monitoring products to support your day-to-day management.
How Do Ketostix Reagent Strips Work?
The chemistry behind these strips is straightforward but clinically reliable. Each strip is impregnated with sodium nitroprusside (also called nitroferricyanide), a reagent that reacts specifically with acetoacetate — one of the three main ketone bodies produced during fat metabolism. When you dip the strip into urine, a colour change occurs if ketones are present. The darker the colour, the higher the ketone concentration.
- Dip the strip into a fresh urine sample for approximately two seconds
- Remove the strip and hold it horizontally to prevent mixing of reagents
- Wait exactly 15 seconds before reading the result
- Compare the colour on the pad to the reference chart printed on the bottle
- Results are graded as negative, trace, small, moderate, or large
It's worth noting that Ketostix strips detect acetoacetate but not beta-hydroxybutyrate, which is the predominant ketone body in DKA. This means a negative result does not entirely rule out ketosis in all circumstances. Always interpret results alongside your symptoms and blood glucose readings.
Who Should Use Ketostix Reagent Strips?
These strips are suitable for a range of people, though the clinical context differs depending on why you're testing. Anyone with diabetes should follow their healthcare team's guidance on when and how often to test for ketones.
- People with type 1 diabetes monitoring for diabetic ketoacidosis
- People with type 2 diabetes who have been advised to monitor ketones by their GP or diabetes nurse
- Individuals following a ketogenic or very low-carbohydrate diet who want to confirm nutritional ketosis
- Pregnant women with diabetes, under medical supervision
They are not intended as a replacement for blood ketone testing in high-risk situations. If you have type 1 diabetes and your blood glucose is above 14 mmol/L, the NHS recommends testing for ketones urgently.
How Do Ketostix Strips Compare to Blood Ketone Monitors?
| Feature | Ketostix Urine Strips | Blood Ketone Monitor |
|---|---|---|
| Method | Urine dip test | Fingerprick blood sample |
| Ketone detected | Acetoacetate | Beta-hydroxybutyrate |
| Cost per test | ~£0.09 per strip | ~£1.00–£2.00 per strip |
| Accuracy in DKA | Moderate | Higher (preferred clinically) |
| Ease of use | Very easy, no device needed | Requires monitor device |
How Should You Store Ketostix Strips and Are They Clinically Reliable?
Storage matters more than most people realise with reagent strips. Keep the bottle tightly closed, store below 30°C, and avoid exposure to moisture, direct sunlight, or heat. Never store strips in the bathroom or near a window. Once opened, use within the expiry date printed on the bottle — using expired strips can produce inaccurate results, which could be misleading in a clinical context.
As a diagnostic aid, ketone urine test strips are reliable when used correctly and within their shelf life. They are not a substitute for professional medical assessment. If you're also managing other aspects of your health, our vitamins and supplements range may support your overall wellbeing alongside your monitoring routine.
This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.
Ketostix Reagent Strips for Ketone Urinalysis - 50 Test Strips specifications
| Treatment category | Diabetes monitoring / Ketone urinalysis |
| Mechanism of action | Sodium nitroprusside reacts with acetoacetate in urine to produce a colour change indicating ketone concentration |
| Effective for | Detecting urinary ketones in diabetes management and ketogenic diet monitoring |
| Suitable for | Adults and children (under medical supervision); people with type 1 or type 2 diabetes; individuals on ketogenic diets |
| Active ingredient | Sodium nitroprusside (nitroferricyanide) |
| Pack size | 50 test strips |
| UK classification | General Sale / Medical Device |
| Preparation | Reagent-impregnated plastic strip |
| Route of administration | Urinalysis (urine dip test) |
Specifications of Ketostix Reagent Strips for Ketone Urinalysis - 50 Test Strips
What Are Ketostix Reagent Strips and What Are They Used For?
Ketostix Reagent Strips are single-use diagnostic test strips designed to detect the presence and approximate concentration of ketones in urine. They are used primarily by people with diabetes to screen for diabetic ketoacidosis (DKA), a serious complication that can develop when the body produces excess ketones. They are also used by people following ketogenic or very low-carbohydrate diets to confirm they have entered a state of nutritional ketosis.
The NHS recommends that people with type 1 diabetes test for ketones whenever their blood glucose is consistently elevated, when they feel unwell, or when they suspect DKA. Ketostix strips provide a rapid, non-invasive way to do this at home, giving you a result within 15 seconds of dipping the strip in urine.
What Do You Need to Know Before Using Ketostix Strips?
Before using these strips, it's important to be aware of certain situations where results may be unreliable or where additional medical advice is needed.
Do not use these strips if:
- The strips are past their expiry date
- The strips have been exposed to moisture, heat, or direct sunlight
- The colour on the unused strip has already changed from its original cream/off-white colour
- You are unsure how to interpret the results — seek advice from your pharmacist or GP first
Warnings and precautions:
- A moderate or large ketone result in a person with diabetes requires urgent medical attention — do not wait
- Urine ketone testing detects acetoacetate only, not beta-hydroxybutyrate; blood ketone testing may be more appropriate in high-risk situations
- Results may be affected by highly concentrated or very dilute urine samples
- Keep strips out of reach of children
- For external diagnostic use only — do not ingest
Medicines and substances that may affect results:
- Levodopa (used in Parkinson's disease) may cause false-positive results
- Large doses of ascorbic acid (vitamin C) may interfere with accuracy
- Mesna (used in chemotherapy) may produce atypical colour reactions
- Phenylketones and phthalein compounds may also affect readings
How Should You Use Ketostix Reagent Strips?
Using these strips correctly is essential for an accurate result. Follow these steps carefully each time you test.
- Wash and dry your hands thoroughly before handling the strips
- Remove one strip from the bottle and replace the cap immediately — moisture degrades unused strips
- Collect a fresh urine sample in a clean, dry container, or pass the strip briefly through the urine stream
- Dip the reagent end of the strip into the urine for approximately two seconds
- Remove the strip and hold it horizontally — do not shake or blot the strip
- Wait exactly 15 seconds
- Compare the colour of the reagent pad to the colour chart on the bottle label in good lighting
- Record your result and note the time and date
- Dispose of the used strip safely in household waste
| Indication | Age Group | Frequency | Action if Positive |
|---|---|---|---|
| Type 1 diabetes monitoring | Adults and children (supervised) | When blood glucose >14 mmol/L or feeling unwell | Seek urgent medical advice if moderate/large |
| Type 2 diabetes (as directed) | Adults | As advised by GP or diabetes nurse | Contact GP if unexpected positive result |
| Ketogenic diet monitoring | Adults | Daily or as preferred | Trace to small = nutritional ketosis confirmed |
What Are the Possible Side Effects of Ketostix Strips?
Ketostix strips are a diagnostic device rather than a medicine taken internally, so systemic side effects are not expected. However, a small number of users may notice the following.
Common:
- Mild skin irritation if the reagent contacts skin for a prolonged period
- Staining of fingers from the reagent pad
Less common / device-related issues:
- Inaccurate readings due to improper technique or storage
- Colour changes on unused strips indicating degradation
If you experience any unexpected skin reaction, rinse the affected area with water. If irritation persists, consult your pharmacist. You can also browse our electrical health and diagnostic range for additional monitoring tools that may complement your routine.
How Should You Store Ketostix Reagent Strips?
- Store at room temperature, below 30°C
- Keep away from direct sunlight, heat sources, and moisture
- Always replace the cap firmly after removing a strip
- Do not store in the bathroom or kitchen where humidity is high
- Do not remove the desiccant (silica gel) from the bottle
- Do not use strips after the expiry date printed on the bottle
- Keep out of reach and sight of children
- Do not freeze
If you're managing diabetes alongside other health concerns, our first aid collection includes a range of products to help you stay prepared at home.
References
- https://www.nhs.uk/conditions/diabetic-ketoacidosis/
- https://www.nhs.uk/conditions/type-1-diabetes/living-with-type-1-diabetes/monitoring-blood-glucose/
- https://www.nhs.uk/conditions/type-1-diabetes/
- https://www.nhs.uk/conditions/type-2-diabetes/
- https://www.nhs.uk/conditions/diabetes/
- https://bnf.nice.org.uk/treatment-summaries/diabetes-mellitus/
Written and reviewed by our qualified team
Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.
Frequently Asked Questions
Where can I buy ketone urine test strips online in the UK?
You can buy Ketostix Reagent Strips for Ketone Urinalysis directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £4.44 for 50 strips. No prescription is needed as these are available over the counter. They're dispatched quickly and discreetly to your door, making it easy to keep your supply topped up without visiting a pharmacy in person.
How do Ketostix reagent strips detect ketones in urine?
Ketostix strips contain sodium nitroprusside, a chemical reagent that reacts with acetoacetate — a ketone body produced when the body burns fat for fuel — to produce a visible colour change on the strip's reagent pad. The intensity of the colour corresponds to the concentration of ketones present, ranging from negative through to large. You simply compare the pad colour to the reference chart on the bottle to read your result.
How do I use Ketostix strips correctly step by step?
Remove one strip from the bottle and recap it immediately to protect the remaining strips from moisture. Dip the reagent end into a fresh urine sample for two seconds, then hold the strip horizontally and wait exactly 15 seconds before comparing the colour to the chart on the bottle. Read the result in good natural or artificial lighting for the most accurate interpretation.
What is the best time of day to test for ketones in urine?
The first morning urine sample is generally the most concentrated and therefore gives the most consistent ketone reading, which is why many people on ketogenic diets prefer to test first thing. However, if you have diabetes and feel unwell or your blood glucose is elevated, you should test immediately regardless of the time of day. Always follow the specific guidance given by your GP or diabetes care team.
Can Ketostix strips give a false positive or false negative result?
Yes, false readings are possible in certain circumstances. Expired or improperly stored strips, highly dilute urine, and certain medicines — including levodopa and high-dose vitamin C — can all affect the accuracy of the result. A false negative is also possible in early DKA because Ketostix detect acetoacetate but not beta-hydroxybutyrate, which is the predominant ketone in that condition. If you're concerned about your result, speak to your pharmacist or GP.
Who is eligible to use Ketostix ketone urine test strips?
Ketostix strips are suitable for adults and children (under appropriate supervision) who need to monitor urinary ketone levels. They are most commonly used by people with type 1 diabetes, people with type 2 diabetes as directed by their healthcare team, and adults following a ketogenic or very low-carbohydrate diet. Pregnant women with diabetes should only use them under medical supervision. You can browse our full diabetes monitoring range for additional tools to support your care.
What does a positive ketone result mean if I have diabetes?
A trace or small positive result may indicate that your body is beginning to use fat for energy, which can happen during illness or when insulin levels are low. A moderate or large result in someone with diabetes is a medical concern and may indicate diabetic ketoacidosis (DKA), which requires urgent medical attention — call 111 or go to A&E if you also feel unwell. Never ignore a high ketone reading if you have type 1 diabetes.
Are Ketostix strips suitable for monitoring a keto diet?
Yes, Ketostix strips are widely used by people following a ketogenic diet to confirm they have entered nutritional ketosis. A trace to small reading typically suggests the body is producing and excreting ketones, which is consistent with fat-burning. Keep in mind that urine ketone levels can fluctuate throughout the day and may decrease over time as the body becomes more efficient at using ketones, even if you remain in ketosis.
How do Ketostix urine strips compare to blood ketone monitors?
Ketostix urine strips are significantly cheaper per test and require no device, making them convenient for routine monitoring. Blood ketone monitors measure beta-hydroxybutyrate directly and are considered more clinically accurate, particularly in DKA screening. For everyday ketogenic diet tracking or low-risk monitoring, urine strips are a practical and cost-effective option; for high-risk diabetes situations, blood ketone testing is generally preferred by clinicians.
How long do Ketostix strips last once opened?
Once opened, Ketostix strips should be used before the expiry date printed on the bottle — opening the bottle does not reset this date. However, exposure to moisture, heat, or light after opening can degrade the strips faster than the printed date suggests. Always store the bottle with the cap tightly closed, away from humidity, and check that unused strips still show their original cream/off-white colour before use.
What should I do if my ketone reading is high?
If you have diabetes and your result shows moderate or large ketones, seek urgent medical advice — contact your GP, call NHS 111, or go to your nearest A&E, especially if you feel sick, are vomiting, or have abdominal pain. Do not wait to see if the reading improves on its own. If you are on a ketogenic diet and feel well, a high reading is less likely to be dangerous, but it's still worth discussing with a healthcare professional if you're unsure.
Can children use Ketostix ketone test strips?
Children with type 1 diabetes may need to use ketone test strips as part of their diabetes management plan, but this should always be done under the guidance of a paediatric diabetes team or GP. The strips themselves are safe for use in children when used correctly, but interpreting results and deciding on next steps should involve a healthcare professional. Keep the strips stored safely out of reach of young children when not in use.
Do any medicines interfere with Ketostix strip results?
Yes, certain medicines can affect the accuracy of Ketostix results. Levodopa (used for Parkinson's disease) is known to cause false-positive readings, while high doses of ascorbic acid (vitamin C) and mesna (used in chemotherapy) may also interfere. If you take any regular medicines, it's worth checking with your pharmacist whether they could affect your ketone test results. You can also explore our vitamins and supplements section if you're reviewing your supplement intake.
How should I store Ketostix strips to keep them accurate?
Store Ketostix strips at room temperature below 30°C, in their original bottle with the cap tightly closed after each use. Avoid storing them in the bathroom, near a window, or anywhere with high humidity or temperature fluctuations. Do not remove the desiccant from the bottle, and never freeze the strips. Proper storage is one of the most important factors in ensuring reliable results every time you test.
What are the latest research findings on urine ketone testing in diabetes?
Current clinical guidance, including NHS and NICE recommendations, continues to support urine ketone testing as a practical first-line screening tool for DKA in people with type 1 diabetes, particularly in community settings where blood ketone meters may not be immediately available. Research has increasingly highlighted that blood ketone testing (measuring beta-hydroxybutyrate) is more sensitive in early DKA, but urine strips remain a valuable, accessible option. Ongoing diabetes management guidelines recommend that all people with type 1 diabetes have access to ketone testing of some form.
