Which test is most commonly used to indicate anemia?

The complete blood count (CBC) is a comprehensive blood test that plays a crucial role in diagnosing various health conditions, including anemia. Anemia is characterized by a deficiency of red blood cells or hemoglobin in the blood, both of which are key components assessed in a CBC.

In a CBC, the hemoglobin and hematocrit levels are measured, which provide direct indications of the oxygen-carrying capacity of the blood. Low levels of hemoglobin can indicate anemia, prompting further investigation to determine the underlying cause, whether it be iron deficiency, vitamin deficiencies, or chronic diseases.

Other tests listed do not serve the primary purpose of diagnosing anemia. The hemoglobin A1c test is used primarily to monitor long-term glucose control in individuals with diabetes, and a blood glucose test measures the amount of glucose in the blood to diagnose diabetes or hypoglycemia. The prothrombin time test assesses blood clotting and is not related to red blood cell or hemoglobin levels. Thus, the CBC stands out as the test most commonly used for the indication of anemia.