There may be times when your BUZUD CGM readings don’t exactly match your blood glucose meter values—but don’t worry. These differences are usually temporary and often resolve over time. Common reasons for this include:

1. The first 24 hours of a new sensor

When a BUZUD CGM sensor is newly inserted, readings may initially vary more from fingerstick results. This is normal. As the sensor stabilizes during the first 24 hours, the readings typically become more consistent with blood glucose measurements.

2. Rapid changes in glucose levels

When your glucose levels are changing quickly—such as after meals, during exercise, or after insulin—the values from your CGM and blood glucose meter may differ. That’s because CGMs measure glucose in interstitial fluid, while meters measure it directly in blood. Blood glucose usually changes slightly earlier than interstitial glucose, so a time lag is expected. Once your glucose stabilizes, the readings typically align more closely.

3. Pressure on the sensor

Physical pressure on the CGM sensor (e.g., from tight clothing or lying on it while sleeping) can temporarily affect the readings. Once the pressure is relieved, the values should return to normal.

When should I consider calibrating?

• If BUZUD CGM readings are consistently higher or lower than your meter and always fall outside the ±20% margin, you may consider calibrating.
• You should also consider calibration if the CGM and meter readings don’t match, and your symptoms or expectations align more closely with the meter value.

To evaluate sensor accuracy over time, observe your BUZUD CGM readings over several hours rather than relying on a single moment.

For more information about CGM accuracy and the 20/20 guideline, please refer to our official user guide.