In preparing for a serum glucose test, which instruction is correct?

In preparing for a serum glucose test, which instruction is correct?

• A. Eat your usual breakfast
• B. Have clear liquids for breakfast
• C. Take your diabetes medication as usual before the test
• D. Do not ingest anything before the test

Answer: (D)

Fasting is what this question is testing. To get an accurate serum glucose result, you want a measurement of your baseline glucose without the influence of a recent meal. After eating, glucose rises as carbohydrates are digested, so the reading would reflect a post-meal level rather than your fasting level, making it harder to compare with standard reference values or track true glucose control. Taking diabetes medications as usual before the test can also alter glucose levels in unpredictable ways, further distorting the result. That’s why the correct approach is not to ingest anything before the test, following any specific instructions your clinician provides (often with permission to drink water and with adjustments to meds if advised). If you accidentally eat, tell the testing clinician so the test can be rescheduled if needed.

Fasting is what this question is testing. To get an accurate serum glucose result, you want a measurement of your baseline glucose without the influence of a recent meal. After eating, glucose rises as carbohydrates are digested, so the reading would reflect a post-meal level rather than your fasting level, making it harder to compare with standard reference values or track true glucose control. Taking diabetes medications as usual before the test can also alter glucose levels in unpredictable ways, further distorting the result. That’s why the correct approach is not to ingest anything before the test, following any specific instructions your clinician provides (often with permission to drink water and with adjustments to meds if advised). If you accidentally eat, tell the testing clinician so the test can be rescheduled if needed.