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 ...

To check if you have a cancer called multiple myeloma, your doctor may ask you to get a test for M protein. If M protein shows up in your blood or urine, it's a sign you might have that disease or ...

A new blood test can detect more than 50 types of cancer, as well as where in the body they originated — even before symptoms develop. Share on Pinterest A new blood test could revolutionize cancer ...