The hematocrit blood test determines the percentage of red blood cells (RBC's) in the blood. Blood is composed mainly of red blood cells and white blood cells suspended in an almost clear fluid called serum. The hematocrit test indicates the percentage of blood by volume that is composed of red blood cells. The condition called "anemia" results from having too few red blood cells. Anemia causes a variety of symptoms. The hematocrit is a basic test that can tell a physician a lot about a person's health. This test is the usual method for determining anemia.
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- WHAT IT TESTS: Measure hematocrit levels.
- WHY TAKE IT: Check for anemia, along with diagnose or monitor a number of conditions and diseases that affect red blood cells.
- REQUIRES FAST? No.