If an ACCU-CHEK user loses the black code key for his blood glucose monitor, he can fill out an online request form for a free replacement code key, according to ACCU-CHEK. However, if the display panel on the meter provides a reading of 113, a new code key is unnecessary.
A blood glucose meter needs to be coded before use in order to ensure an accurate measurement of a user's blood sugar levels, notes ACCU-CHEK. The company previously included either a white or a black code key with each of their test-strip vials. Users needed to re-code their blood glucose meter with each new vial of test strips. In order to simplify the testing process, ACCU-CHEK phased out the use of white code keys and no longer includes code keys with their test-strip vials, as of 2015. They also introduced one-time coding using a black code key which, once inserted into the meter, can remain in use for the meter's lifetime; it does not need to replaced with each new vial of test strips.
Most ACCU-CHEK blood glucose meters, including the ACCU-CHEK Compact Plus and the ACCU-CHEK Nano meters, no longer need to be coded before use because they come pre-coded, reports ACCU-CHEK. The ACCU-CHEK Aviva Plus Silver blood glucose meter is the only one of ACCU-CHEK's products which uses the black code key. Replacement code keys are sent through the mail, with a limit of five code keys per customer.