Mistakes at measuring your blood glucose can lead to wrong results. There are multiple causes: operating problems with the meter, defective test strips or meters, different interferences.
The patient has to be trained to use the meter and the test strips to avoid problems. Using a meter is normally very easy and the training can be done quickly.
Tests with control solution from time to time ensure best quality of the blood glucose testing. It makes sense to perform a test with control solution when opening a new vial of test strips, if the meter dropped down or was somehow damaged, if the test results do not reflect your personal feeling or if results are somehow suspect.
Possible sources of error
Most problems are caused by mistakes during operation. Only on rare occasions meter, test strips or other interferences cause problems.
Damaged test strips
Test strips should not be exposed to direct sunlight, extreme humidity, cold or warm temperatures and should not be used after expiration date. These sensible diagnostics have to stored in the original vials, which should be closed immediately after taking out one strip.
Blood glucose meters are high precision instruments and should be handled after the instructions of the manufacturer. The meter is operated with sufficiently charged batteries. Correct insertion of the test strip has to be checked.
Operation of a new meter has to be trained. The correct sampling of a blood drop should be educated as well.