5 Home blood glucose meters are considered clinically accurate if the result is within 20 percent of what a lab test would indicate. For example, a glucose meter result of 100 mg/dL could vary on the downside to 80 mg/dL or on the upside to 120 mg/dL and still be considered accurate.
Can glucometer be wrong?
Dirt, dust and other contaminants can also give an inaccurate reading. But this was a thing of the past, with new technology, its very rare that you get an inaccurate reading if the meter is dirty. But one must try not to let the meter get too dusty or dirty and clean and spillage on it to be on the safer side.
How accurate are blood glucose monitors?
The new 2019 FDA drafted rules for personal use glucose meters will require: 95% within +/- 15% across the measuring range. 99% within +/- 20% across the measuring range.
Do you need to calibrate a glucometer?
Glucometers must be calibrated to ensure accurate readings are provided to the person performing the test. While some glucometers can calibrate automatically, most will require the user to manually calibrate.