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 ...

Medically reviewed by Femi Aremu, PharmD A creatine kinase (CK) test measures the levels of the enzyme in your blood.High levels can be a sign of damage to the muscles, heart, or brain.A doctor may ...

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 ...

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 ...

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 ...

Normal ferritin levels range from 15-150 ng/mL for females and 15-200 ng/mL for males. High ferritin levels can indicate an iron overload or inflammation. Eating iron-rich foods can help you raise ...

Dr. Omar Al-Heeti is an assistant professor of medicine at Southern Illinois University and practices internal medicine with a specialty in infectious diseases. He received his medical degree from the ...

Lindsay Modglin is a nurse and professional writer who regularly writes about complex medical topics, as well as travel and the great outdoors. She holds a professional certificate in scientific ...

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 ...

Though my cortisol test results stressed me out, I'm glad I know more about how cortisol affects my health. Anna Gragert Senior Editor, Health and Home Anna Gragert (she/her/hers) was previously the ...