Diurnal cortisol tests measure your cortisol levels at various points, from the time you wake up until the time you go to bed. They can help a healthcare professional visualize your adrenal gland ...

Ferritin is a protein that stores and releases iron (a mineral) in the body. A ferritin test measures how much of this protein is in your blood, helping diagnose health conditions caused by too much ...

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 ...