Which of the following is not part of the complete blood count?

The correct answer is APPT, as it is not included in a complete blood count (CBC). A CBC is a common blood test that evaluates several components of blood, including the white blood cell (WBC) count, hemoglobin levels, and platelet count. Each of these components provides crucial information about a person's overall health, such as their immune function, the ability to transport oxygen, and clotting ability.

APPT, or Activated Partial Thromboplastin Time, is a test used to assess the blood's ability to clot and is often part of coagulation studies rather than a complete blood count. It measures the time it takes for blood to clot in response to specific pathogens. Thus, while vital in evaluating coagulation disorders, it is not part of the standard parameters measured in a CBC. Understanding these distinctions helps in recognizing the specific tests that make up different laboratory assessments in clinical practice.