For diabetic patients, monitoring blood sugar levels and understanding its fluctuations can significantly impact their overall treatment. The acceptable margin of error is often a major concern. Multiple data points from the World Health Organization and the U.S. Food and Drug Administration indicate that a blood glucose meter's testing error within 20% will not affect the patient's treatment plan. For example, three consecutive blood glucose measurements might be 6.4 mmol/L, 5.5 mmol/L, and 5.9 mmol/L. Although the numbers are slightly different, it shows good blood sugar control, thus requiring no change to the treatment plan.
This is a common characteristic of all blood glucose meters, not a problem specific to any particular brand or model. Patients often encounter inconsistent results between different brands or even between the same brand of blood glucose meter. This is perfectly normal because rapid blood glucose meters measure a range, and slight variations are common between measurements, but these differences are usually minimal. A rapid blood glucose meter is generally accurate if the error between its readings and a biochemical analyzer's venous blood glucose readings is less than 20%. Some patients misunderstand the data from the meter, believing that the meter's readings should be identical to venous blood glucose measurements. If these two values differ, they believe the product has a quality issue. However, in reality, whether it's a home blood glucose meter or a hospital blood glucose testing instrument, the measured values will not be the same every time. It should be said that a blood glucose meter with an error range within ±10% is very good, and the general requirement is an error of no more than ±20%. There is no absolute correctness in this regard, only relative correctness. Of course, some incorrect measurement methods can also affect the accuracy of the results.
