A blood component counter device performs a test on blood to evaluate overall health and detect a wide range of disorders, including anemia and infections. The device measures all blood components, including red blood cells, white blood cells (in their five types), hemoglobin in red blood cells, platelets, and the ratio of red blood cells to the liquid component or plasma in the blood. Abnormal increases or decreases in the blood components detected by the complete test may indicate a medical condition that requires further evaluation