When fasting for blood work can you drink black coffee or tea?

It depends on the specific instructions provided by your healthcare provider or laboratory. Black coffee without milk or sugar and plain tea without milk or honey are often allowed during a fasting period for blood work, as they do not contain calories or significantly affect the results of most tests. However, it's important to check the specific requirements with your healthcare professional or the lab to ensure accuracy. Some tests, such as those for glucose or insulin levels, may require stricter fasting conditions, and even black coffee or tea may not be permitted.