Blood draws for several kinds of diagnostic tests require you to fast for several hours. Eating or drinking anything besides water can skew the results, leading to you needing to be retested. You may ...

You can consume nothing but water for at least 8 hours before a fasting glucose test. You may also need to follow a low carb diet and avoid exercise for some time before. A fasting glucose test ...

This article was reviewed by Felix Gussone, MD. In this guide, we’ll break down what most biomarker lab tests measure, how to prepare for them, and what to do once you receive your results. Not ...