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Are You Making These 5 Mistakes with Your Blood Glucose Monitoring?
18 Sep 2025 By Ramona Sharma, M.D.

Are You Making These 5 Mistakes with Your Blood Glucose Monitoring?

Managing blood glucose levels is a cornerstone of diabetes management. Accurate and consistent blood glucose monitoring provides essential data for making informed decisions about diet, exercise, and medication. However, many people inadvertently make mistakes that can lead to inaccurate readings and, consequently, compromised health management. This article will delve into five common mistakes made during blood glucose monitoring and offer actionable solutions to ensure accurate results. Understanding Your A1C Test What Your Numbers Really Mean

1. Neglecting Proper Hand Hygiene: The Unseen Culprit

One of the most frequent and overlooked errors in blood glucose testing is neglecting proper hand hygiene. Even seemingly clean hands can harbor residues of food, lotions, or other substances that can significantly alter your blood glucose readings. Imagine testing your blood sugar after peeling an orange, without washing your hands. Traces of sugar from the orange can contaminate the blood sample and give you an artificially elevated reading. What Is A Normal Blood Sugar Range A Guide For Before And After Eating

Solution:

  • Wash your hands thoroughly: Use warm water and soap for at least 20 seconds before each test.
  • Dry hands completely: Damp hands can dilute the blood sample, potentially skewing results.
  • Avoid alcohol-based sanitizers (if possible): While convenient, some sanitizers contain ingredients that can interfere with testing. Soap and water are generally preferred. If using a sanitizer, ensure it's completely dry before proceeding.

By making hand hygiene a non-negotiable step in your blood glucose monitoring routine, you eliminate a major source of error.

2. Using Expired or Improperly Stored Test Strips: A Matter of Reliability

Blood glucose test strips are sensitive and can be affected by environmental factors. Using expired strips or storing them improperly can degrade the chemicals that react with your blood, leading to inaccurate or completely unusable readings. These strips are designed with specific enzymes that react with glucose in your blood to provide an electrical signal that the meter can interpret into a numerical value. If the strips are compromised, the enzyme's efficacy is reduced, giving wrong results.

Solution:

  • Check the expiration date: Always verify that the test strips are not expired before use.
  • Proper Storage: Store test strips in their original, tightly closed container in a cool, dry place away from direct sunlight and moisture. Avoid storing them in the bathroom or other humid environments.
  • Avoid mixing different brands or lots: Use only the test strips recommended for your specific meter and avoid mixing strips from different lot numbers.
  • Discard damaged strips: Discard any strips that appear discolored or damaged.

Following these storage guidelines can help ensure that your blood glucose readings are reliable and accurate. Your A1C Goal What It Means For Long Term Health And Diabetes Care

3. Improper Lancing Technique: Minimizing Pain, Maximizing Accuracy

The lancing technique significantly impacts both comfort and accuracy during blood glucose monitoring. Insufficient blood volume, resulting from a shallow or poorly executed lance, often leads to the temptation to squeeze the finger excessively. This can dilute the blood sample with tissue fluid, causing inaccurate readings.

Solution:

  • Use the correct lancing device setting: Adjust the depth setting on your lancing device to a level that provides an adequate blood sample without causing unnecessary pain.
  • Choose the right lancing site: Lance on the sides of your fingertips rather than the pads, as they have fewer nerve endings. Rotate fingers regularly to prevent soreness.
  • Use gentle pressure, not squeezing: Gently milk your finger toward the puncture site to encourage blood flow. Avoid excessive squeezing.
  • Maintain good hydration: Dehydration can make it more difficult to obtain a sufficient blood sample.
  • Warm your hands: Cold hands can restrict blood flow, making it harder to draw blood. Run your hands under warm water or massage them to improve circulation.

4. Incorrect Meter Calibration or Coding: Ensuring Meter Accuracy

Blood glucose meters require periodic calibration or coding to ensure accurate readings. Some meters require manual coding each time a new batch of test strips is used. Failing to calibrate or code your meter correctly can lead to significant discrepancies in your blood glucose results. Think of it like a scale that needs to be zeroed out before you can accurately weigh yourself.

Solution:

  • Understand your meter's requirements: Carefully read the user manual to determine if your meter requires coding or calibration.
  • Code or calibrate as needed: Follow the manufacturer's instructions for coding or calibrating your meter. This often involves entering a code number found on the test strip container.
  • Use control solutions: Periodically use control solutions (available at most pharmacies) to verify the accuracy of your meter. Compare the results to the range provided on the control solution bottle. If the results are outside the expected range, contact your healthcare provider or the meter manufacturer.

5. Ignoring Regular Meter Maintenance: Keeping Your Device in Peak Condition

Just like any electronic device, blood glucose meters require regular maintenance to ensure they are functioning correctly. Dust, debris, and battery issues can all affect the accuracy of your meter. Regular blood glucose meter maintenance prevents errors and allows for better and more accurate blood sugar monitoring.

Solution:

  • Clean your meter regularly: Use a soft, slightly damp cloth to clean the meter. Avoid using harsh chemicals or submerging the meter in water.
  • Replace batteries as needed: Low batteries can cause inaccurate readings. Replace batteries as indicated by your meter.
  • Store your meter properly: Keep your meter in a clean, dry place away from extreme temperatures.
  • Periodically check for damage: Inspect the meter for any signs of damage, such as cracks or loose parts.
  • Follow manufacturer guidelines: Always adhere to the specific instructions provided in the meter's user manual for cleaning, maintenance, and troubleshooting.


By avoiding these five common mistakes, you can significantly improve the accuracy and reliability of your blood glucose monitoring, leading to better informed decisions about your diabetes management. Remember to consult with your healthcare provider for personalized advice and guidance on blood glucose monitoring. Accurate monitoring, combined with expert advice, is crucial for achieving optimal health outcomes.


Mistake Solution Impact on Blood Glucose Monitoring
Neglecting hand hygiene Wash hands thoroughly with soap and water. Reduces risk of contamination and inaccurate readings.
Using expired or improperly stored test strips Check expiration dates and store strips properly. Ensures reliability and accuracy of test results.
Improper lancing technique Use correct lancing depth, choose appropriate site, and avoid excessive squeezing. Minimizes pain and ensures adequate blood sample for accurate reading.
Incorrect meter calibration or coding Calibrate or code meter according to manufacturer's instructions. Guarantees meter accuracy and reliability.
Ignoring regular meter maintenance Clean meter, replace batteries, and store meter properly. Maintains meter performance and accuracy.
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