What is the primary test used to determine anemia?

The primary test used to determine anemia is the hemoglobin test. This test measures the level of hemoglobin in the blood, which is a protein in red blood cells responsible for transporting oxygen throughout the body. A low hemoglobin level can indicate that a person may have anemia, as this condition is characterized by a deficiency in the number or quality of red blood cells or hemoglobin.

While the red blood cell count can also provide useful information regarding anemia, it does not specifically measure the hemoglobin concentration, which is critical for diagnosing the condition. The white blood cell count and platelet count do not assess red blood cell or hemoglobin levels and are thus not used as primary tests for anemia. The hemoglobin test is widely regarded as a direct and efficient way to evaluate an individual’s blood oxygen-carrying capacity and diagnose anemia.