Final answer:
The code on glucose curettes should be compared to the glucometer when a new box of test strips is opened or when using a new glucometer to ensure accurate glucose level readings.
Step-by-step explanation:
The code on glucose curettes should be compared to the code on the glucometer every time a new box of test strips is opened or when a new glucometer is used. This ensures that the glucometer is calibrated to the specific batch of test strips in use, which is crucial because different batches may have slight variations that could affect the accuracy of the blood glucose readings. Such calibration helps maintain the accuracy of glucose measurements in the blood, which is essential for monitoring and management of diabetes mellitus, where hyperglycemia is a key concern.