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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.
HCT and HGB are extremely common blood tests, which are usually measured together. HCT -- short for hematocrit -- is the volume of red blood cells (RBCs) within a specific volume of blood. HGB -- or hemoglobin -- is the amount of HGB in a specific volume of blood. As HGB is the oxygen-carrying protein within RBCs, the HCT and HGB are closely linked. When one falls, the other generally falls as well. Both HCT and HGB provide approximations of the number of RBCs contained in the blood, and low values indicate the presence of anemia. Low HCT and HGB may be caused by a reduced total number of RBCs or by excessive fluid within the blood, which dilutes the RBCs. The number of RBCs may be reduced by blood loss, impaired RBC production or excessive RBC destruction.