The complete blood count (CBC) is a comprehensive blood test that measures the main components of the blood, including red blood cells (RBCs), which carry oxygen; white blood cells (WBCs), which fight infections; and platelets (PLTs), which help with blood clotting. The test also measures hemoglobin (Hgb) and hematocrit (Hct), providing information about the proportion of red blood cells relative to the total blood volume. This test is used to assess overall health and detect conditions such as anemia, infections, and other blood disorders.