Your doctor says everything looks fine, but you still feel terrible. The problem might not be your health but how labs define “normal.” Understanding the difference between normal and optimal could ...

Professor of Chemical and Biological Engineering, Biomedical Engineering, and Public Health, Colorado State University Your blood serves numerous roles to maintain your health. To carry out these ...

What Is a Cortisol Test? A cortisol test measures the level of cortisol in your blood, urine or saliva. Cortisol is a hormone that's important throughout the body for maintaining blood pressure, blood ...

Steffini Stalos, DO, FCAP, is a pathology and lab medicine physician. She is also the chief medical officer of the lab consultancy firm Blood Associates, LLC. Mean corpuscular hemoglobin concentration ...

This article was reviewed by Felix Gussone, MD. Key Takeaways: Preparing properly for lab tests helps ensure your results are accurate and reliable. Some tests — … ...