Tips for Ensuring Testing Accuracy

  • Last updated November 15, 2017

Things that might affect the accuracy of your blood glucose and ketone readings.


There are many factors that affect home ketone and glucose testing. We list some of the most common ones below.

    • Strip placement in the port and fill level. For accurate results, the strip must be placed firmly into the port and the blood sample must completely fill the channel. This is probably the single-most common mistake. It’s not uncommon for people to pull the strip away from the blood sample before the channel is completely full.
    • Hygiene and testing protocol. It’s important to wash and dry your hands before testing and closely follow the instructions for operating your meter, like coding each new vial of ketones (if coding is required for your meter). Learn more about the proper testing protocol here.
    • Hydration and the amount of red blood cells in the blood. If you are severely dehydrated or anemic, your test results may be less accurate.
    • Altitude, temperature, and humidity. High altitude, low and high temperatures, and humidity can cause unpredictable effects on test results.
    • Interfering substances. Some substances, such as Tylenol, elevated uric acid, or low glutathione may interfere with your glucose test results.
    • Food or contaminants like lotions, exogenous ketones, and MCT oil on the skin or strips. If strips come into contact with a contaminant, results may not be accurate.
    • Exposure to air. Studies have shown that extended exposure of the blood sample to air can result in readings with a 10% variance, as a result of evaporation, coagulation, and changes in a small volume of blood.
    • Strip expiration. Check your strip expiration.

Why are my results different if I take multiple tests from the same blood sample?

When testing you blood ketones or glucose, you may receive different measurements even from the same blood sample. It is not uncommon in home testing given the small size of the sample.

For Ketones:

For readings 2.0 mmol/L or less:

    • 100% of the time we will hit the target within 0.5 mmol/L of your lab results
    • 90% of the time we will hit the target within 0.3mmol/L of your lab results

For readings over 2 mmol/L:

    • 100% of the time we will be within 25% of your lab results
    • 97% within 15% of your lab results
    • 81% within 10% of your lab results

For Glucose:

For readings 2.0 mmol/L or less:

    • 100% of the time we will hit the target within 0.5 mmol/L of your lab results
    • 90% of the time we will hit the target within 0.3mmol/L of your lab results

For readings over 2 mmol/L:

    • 100% of the time we will be within 25% of your lab results
    • 97% within 15% of your lab results
    • 81% within 10% of your lab results

Did we answer your question?

25 reviews


  2. Answer the question..! I’m assuming that saying it’s not accurate would suffice.

  3. I will often follow all correct procedures for measuring blood glucose and get readings 20% or more different. If I get a morning fasting glucose of 120 or 124 and I repeat the measurement I will get 94 or 100. Seems wildly inaccurate enough to not be useful. It also costs me for double the number of glucose test strips.

  4. my glucose was 98 in one place and 85 in another sample. this level of inaccuracy is not okay

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  8. I have been using the Keto Mojo for a couple months and all is good. Suddenly my reading seem to be very inaccurate compared to previous readings with the same diet. Is there a way to calibrate the Keto Mojo? When I enter the lot # for my strips to try and use the control solution it tells me that they are invalid. My glucose lot # is U210137 and the Ketone lot # is U210140. Please help.

  9. I took a faulty glucose reading, 60 (hyper), then immediately took another, 91 (normal). How do I delete the faulty measurement from my GK+ meter?

  10. There are substances used by people (including myself) who typically also use your device for both glucose and ketone testing. Please post a list of potential interfering substances relevant to your particular test chemistry. Sugar alcohols, medicines, dietary supplements etc. and the likely effect on test results, the direction of error and its degree.

  11. I am worried that my new meter may not be accurate and am interested in testing the control samples that came with it. There are no instructions that I can find that explain how to test the meter. I suppose that it involves substituting a drop of solution for a drop of blood but I would still have no idea of the value of the control.
    Can you help?

  12. Hello. I buy this before month and I have question about accuracy. I make test for glucose and I it was 3.9 mmol and after that I test again and it show 4.5? Why this differences?

  13. My glucose is spiking overnight. I test while fasting and it’s very high. But if I test in my regular glucose meter it will be different then my mojo reading. Today my mojo gave me 124, as my regular cvs meter gave me 102. Why the difference and which one is right?

  14. I am so disappointed in the way this page is set up. Why can’t I see all the questions and answers at once? Why is the video about how to use the Keto Mojo so poor – he does not show close ups of what he is doing – he does not explain where the depth changer is on the tool. How do I clear my history of readings? What is the blinking M folder?

  15. Hi,
    My story is long so I am going to try to make it short. I am 75, had cancer 5 years ago, put myself on a non-cancer diet and then discoverd Keto. I purchased the Keto mojo 3 (?) years ago. It was wonderful to enable my diet success. After 2.5 years I became really thin and my health declined probably because I could not find enough information on nutrition and what to eat. My doctor insisted I stop the diet. A year has passed and I am not starting the diet again. Still worried about nutrition but just feel bette on the keto diet. I have agained 10 pounds over the year. My problem now is my reading on the mojo. If I measure twice or even three times the reading are all over the place. Why ? How can I know where I am if my readings are off so much? I want to stay below 100 for glucose and at least 1.0-1.5 keto. My readings will jump from 113-98 glucose and 1.3-.01 Ketones? .. I change my betteries regularly. I hate not trusting the readings and am using lots of strips. I need help….. If you tell my to buy a new meter I will be upset as I am on a fixed income and the new meters are expensive.

  16. I have been seeing a higher than my normal for Glucose testing and a slightly lower than I expected for Kentones testing. I use the test drops and here is what I saw. I think I have an issue with my tester?

    My blood
    Glucose: 99
    Kentones: 0.7

    The test drops
    Glucose: 105
    Ketones: 2.5

  17. I tested my glucose and it was sky high for me at 133. 5 minutes later I tested and it was 103, which is about right for an early AM glucose for me.I am using the new GKI meter but I have an old one and tested with it and got a reading of 93. Why the discrepancy? Judging by the reactions to whether this answered the question I am guessing others have had this issue. I am so far not impressed with the new GKI meter.

  18. what is the acceptable range for ketone test solution #2?

  19. This morning I tested back to back because I got a reading of 1.0 and I’ve never been that high first thing in the morning. Then I got a 0.4, so now I’m wasting strips as well as confused on why I initially got 1.0.
    What’s the best time to test?

  20. I just tested my blood sugar and ketones. The blood seemed high at 80 (went up from earlier when I am on the second day of a water fast) so I tested again. Second time it was very low 66, so I tested a third time and it came back with 75. These strips are too expensive to not trust a reading. In general when I have checked it with a second strip it is much different.

  21. How do I fix the issue with test strips giving incorrect reading. My device is less than a month old. Strips were stored properly and not expired.

  22. I tested my blood and because I got a 3.9 for my ketones, which I’ve never had a reading that high, I decided to retest. My next two tests were 1.0 and 0.7. My glucose readings were 83, 90, 85 relatively. It’s frustrating to pay so much money for the strips and meter and have to use 3 strips each within 4 minutes to try and get an accurate reading.

  23. I’m looking for the control ranges. The instructions say they are on the box or bottle. No control boxes came in the kit. I don’t see ranges on the bottles.
    Glucose lot# UAN20037 Exp 2022-07-07
    Ketone lot# UEN20024 Exp 2022-07-05
    Thank you for your assistance.

  24. I have been getting a lot of error messages and have went through all of my strips. Can strips be reused if you receive an message and try again?


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