This article was reviewed by Felix Gussone, MD. If you’ve been feeling a bit more couch potato than go-getter lately, dragging through the day, snapping at people for no reason, or wondering where ...

Testosterone tests measure levels of testosterone in the blood. At-home test kits can be convenient, but they cannot diagnose underlying health conditions that cause high or low testosterone. Share on ...

Chronic fatigue, unexplained weight loss or gain, infertility, and hair loss can all signal a hormonal imbalance. You might consider a hormone test if you’re experiencing these or more. Hormone tests ...

What Does a Hematocrit Test Measure? A hematocrit test is a blood test that measures the level of red blood cells in your blood. Your blood is made up of plasma and blood cells. Plasma is the liquid ...

Normal ferritin levels range from 15-150 ng/mL for females and 15-200 ng/mL for males. High ferritin levels can indicate an ...

A vitamin deficiency test can reveal if you’re low on folate, iron, vitamin B12, and more, but you may need guidance to interpret the results. See our dietitian’s take on some of the best vitamin ...