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A hematocrit blood test or an HCT blood test is a test where the total volume of red blood cells is checked vis-a-vis the volume of blood that has been drawn. The HCT blood test is therefore used to determine how much of the blood drawn is made up of red blood cells. There are two factors that are variables when it comes to the HCT blood test results. The number of red blood cells in the blood is one such factor. The other factor is the size of each red blood cell. Also read more ...
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.