In 2017, Dr. Barbi Phelps-Sandall, an obstetrician who has been practicing in the San Francisco Bay area for more than two decades, had just learned about a new blood test only available at select ...

Thyroxine (T4) is the main hormone your thyroid makes. Your thyroid hormones are important because they control how your body uses energy from the food you eat. (Photo Credit: iStock/Getty Images) T4 ...

A blood osmolality test measures the blood for the concentration of certain dissolved particles. This test can show whether a person has an irregular balance of fluids in their body. Osmolality tests ...

The best at-home iron test is convenient, affordable, and accurate. We chose Allergy Test Iron Deficiency Test as the best at-home option. Learn more below. Share on Pinterest Having either ...

The fibrinogen blood test is used to assess how well the protein called fibrinogen — also called coagulation factor I — performs in the blood and to measure its levels in your blood. The test is also ...

The anion gap blood test measures the acid-base and electrolyte balance in the blood. Results can show whether there is an imbalance in a person’s pH levels, which may be making the blood too acidic ...

When her husband was undergoing cancer treatment, Cindy Perez of Southwest Ranches, Fla., learned about a new blood test that could help find early cancers. The 50-year-old said she felt fine, but her ...

Mark Gurarie is a writer covering health topics, technology, music, books, and culture. He also teaches health science and research writing at George Washington University's School of Medical and ...

With two new treatments for Alzheimer’s disease approved in recent years, there’s growing hope for people at risk of the memory-robbing condition. But tests to detect the condition still lag behind.