Table 1.

Classification of potential errors in conducting blood glucose tests

Error Code	Error Category	Evaluation
F1	Errors that make a reading useless (due to the error, it is not possible to anticipate whether the measured blood glucose level is higher or lower than the true value and how great the deviation is).	If only one of these errors is made, the result cannot be interpreted. The test must be repeated (correctly).
F2	Errors that can lead to a false reading (or a false interpretation) in individual cases.	The significance is dependent on the exact situation or the consequence that is drawn.
F3	Errors that can have a negative effect on compliance.	These errors have no impact on the measuring results, but possibly affect the willingness of the patient to perform the self-monitoring
F4	Errors that can make conducting the test more difficult or prevent it entirely (device components).	Either the handling is unsatisfactory or the functionality is impaired.
F5	Errors which make a consequential action / interpretation (by the patient, doctor, or pharmacist) more difficult.	Readings not available for evaluation over the middle term.