Wrong operation procedures can cause the test to fail or produce false results. The operation procedures for various blood glucose meters are similar. Patients must carefully read the instructions and master the operation of the blood glucose meter when testing. For example, some blood glucose meters require a drop of blood before inserting it into the meter for testing. If the waiting time is too long after dropping the blood before inserting it into the meter, it will lead to incorrect results. Residual alcohol after disinfection, moving the test strip during testing, etc., can all affect the test results.