Tag: Medical lab

For many blood tests, only plain water is permitted, while other beverages like coffee are prohibited. This raises a common and important question: is coffee ok when fasting for blood work, and what risks does it pose to your results?

According to the American Diabetes Association, fasting blood tests for glucose and insulin usually require a fasting period of 8-12 hours, during which plain water is the only liquid permitted. This allowance is crucial for maintaining proper hydration and preventing complications during the test.