Regular blood glucose testing is essential for people with diabetes. Many patients buy glucometers for home testing for convenience. However, a number of them overlook critical operating rules, resulting in inaccurate readings. Below are the vital precautions for self blood glucose measurement.

1. Ensure Matching Between Glucometer and Test Strips

Many diabetics are unaware that test strips must be specially matched to their glucometer model; mismatched combinations produce false glucose values. When switching to a new batch of strips, scan or input the strip barcode into the device for calibration before use.

2. Proper Storage of Test Strips

Store strips in a dry, dark environment. Individually wrapped strips are recommended. Damp storage causes strips to absorb moisture and malfunction. Never touch the blood application area of the strip with bare fingers during operation.

3. Disinfect Fingers Fully Before Blood Collection

Sterilize the fingertip with alcohol and wait until the alcohol evaporates completely before pricking. Residual alcohol mixes with blood and interferes with test accuracy. Iodine can also be used for disinfection, but full drying is equally required.

4. Do Not Squeeze the Fingertip Hard

When blood volume seems insufficient, some patients squeeze the finger vigorously to draw more blood. This squeezes tissue fluid into the blood sample, diluting it and creating falsely low glucose readings.

5. Never Reuse Lancets

To cut costs, some patients reuse intact-looking lancets. Lancets are designed for single use only. Repeated use leaves bacteria on the needle, causing wound infection and even bloodstream infections after pricking.

Recommended Testing Time Points

Seven standard daily testing windows are available for selection: pre-meal and 2-hour post-meal for breakfast, lunch and dinner, plus bedtime overnight testing.

• Fasting blood glucose: measured before breakfast.

• Preprandial blood glucose: measured before lunch and dinner.

• Postprandial blood glucose: tested exactly two hours after finishing meals.

For unstable blood sugar, test 4 to 7 time points every day.

Reminder

Frequent self-testing requires strict adherence to the above guidelines. Improper operation distorts blood glucose readings, which may mislead medication and diet adjustments. Mastering these rules guarantees reliable, accurate test results.