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 ...

This story is sponsored by Intermountain LiveWell. If you've ever wondered why your doctor asks you to do a blood test or provide a urine sample at your annual checkup even if you're feeling perfectly ...

You may feel perfectly fine at your annual checkup, but your doctor still orders lab tests. According to Dr. Sydney LeGuyader, an internal medicine physician at Intermountain Health, that is exactly ...

Inside one transparent plastic container on a rack of shelves is someone’s big toe. Inside another, someone else’s uterus. In the complex and bureaucratic health care system, this bright room and its ...

At-home sleep tests are convenient and cheaper than lab studies. But there are some major differences you should know before buying. Taylor Leamey Former Senior Writer Taylor Leamey wrote about all ...

Mohana Ravindranath is a freelance health, science, and tech journalist and a 2025 Association for Health Care Journalists fellow. She was previously a Bay Area health tech correspondent for STAT.

Do you take vitamins or use herbal products? Most of us know that vitamins and herbal products can interact with your medications. But did you know that those same vitamins and herbal products could ...

What Is the CD4:CD8 Ratio Test Used For? CD4 and CD8 are two types of white blood cells in your blood. White blood cells help your body fight infections. If you have HIV infection, your doctor may use ...

This article was reviewed by Felix Gussone, MD. Preparing properly for lab tests helps ensure your results are accurate and reliable. Some tests — like fasting cholesterol or fasting glucose — require ...