Common Mistakes to Avoid When Checking Your Blood Sugar

Checking your blood sugar is a cornerstone of managing diabetes or prediabetes. However, even with the right equipment, inaccurate readings can lead to incorrect decisions about medication, diet, and exercise. Here’s a breakdown of common mistakes to avoid and how to ensure you're getting the most accurate readings possible.

Improper Handwashing

Your hands carry oils, lotions, and residues that can interfere with blood sugar readings. Always wash your hands thoroughly with soap and warm water before testing. Dry them completely before pricking your finger. This simple step can dramatically improve accuracy.

Using Expired Test Strips

Test strips have an expiration date for a reason. After this date, the chemicals that react with glucose degrade, leading to unreliable results. Always check the expiration date before using a strip. Store your strips in their original, tightly sealed container in a cool, dry place to extend their lifespan.

Using the Wrong Meter for the Strips

Different blood glucose meters use different test strips. Using the wrong combination can lead to inaccurate or even non-existent readings. Double-check that the test strips you are using are compatible with your meter.

Insufficient Blood Sample

A small, insufficient blood sample can skew results. Make sure you get a large enough droplet of blood onto the test strip. Prick your finger deep enough to get a good drop, but avoid excessive depth which can cause pain and doesn’t necessarily improve the sample size.

Pricking the Finger in the Same Spot Repeatedly

Repeatedly pricking the same spot on your finger can lead to calluses and toughened skin, making it difficult to get a proper blood sample. Rotate your finger pricking sites to avoid this. The sides and pads of your fingertips are generally less sensitive than the center.

Incorrect Meter Coding

Some meters require you to manually enter a code that matches the lot number on the test strip vial. Failure to do this, or entering the wrong code, will result in inaccurate readings. Consult your meter's manual for specific instructions.

Ignoring Temperature and Humidity

Extreme temperatures and humidity can affect test strip performance. Avoid storing strips in areas exposed to direct sunlight or excessive moisture.

Not Wiping Away the First Drop of Blood

The first drop of blood that appears after pricking your finger may be contaminated with tissue fluid, which can contain higher concentrations of glucose than the subsequent drops. Wipe away this initial drop before testing.

Failing to Calibrate the Meter (If Required)

Some meters require occasional calibration using a control solution. Follow the manufacturer’s instructions for calibration to ensure accuracy.

Not Maintaining the Meter Properly

Regularly clean your meter according to the manufacturer's instructions. This removes debris that can interfere with the mechanism.

Misunderstanding the Meaning of the Reading

A single blood sugar reading doesn't tell the whole story. Understand the context of the reading: was it fasting, before a meal, or after? A1c is also an important metric to monitor long-term blood sugar control.

Ignoring the Device’s Error Messages

If your meter displays an error message, don't ignore it. Consult the user manual to understand the problem and how to resolve it. The error message is there to tell you something is wrong.

Not Keeping a Record of Readings

Keeping a log of your blood sugar readings helps you identify patterns and trends. This information is valuable for your healthcare provider when making adjustments to your treatment plan.

Ignoring Your Healthcare Provider’s Advice

Your healthcare provider can offer personalized guidance on how to properly check your blood sugar and interpret the results. Don’t hesitate to ask questions or seek clarification.

Using Shared Equipment

Sharing blood glucose meters and test strips with others can lead to cross-contamination and inaccurate readings. Each person should have their own equipment.

Not Understanding How Different Factors Affect Blood Sugar

Various factors, such as stress, illness, and certain medications, can influence your blood sugar levels. Be aware of these factors and how they might affect your readings.

Improper Disposal of Sharps

Lancets and test strips are considered medical waste. Dispose of them properly in a sharps container to prevent injury and infection.

Failing to Check the Lancet Depth Setting

Ensure the lancet depth setting is appropriate for your skin thickness. Too shallow a setting won’t produce enough blood; too deep can be painful and cause bruising.

Rushing the Process

Take your time and follow the steps carefully. Rushing can lead to mistakes and inaccurate readings.

By avoiding these common mistakes, you can ensure your blood sugar readings are accurate and reliable, empowering you to make informed decisions about your health.