A Complete Blood Count (CBC) test includes all of the following except?

A Complete Blood Count (CBC) test is a comprehensive panel that evaluates various components of the blood and provides vital information about an individual’s health. It typically includes measurements of hematocrit (the proportion of blood volume that is occupied by red blood cells), hemoglobin (Hgb, the protein in red blood cells that carries oxygen), and platelet count (which measures the number of platelets in the blood and is essential for proper clotting).

Prothrombin Time (PT), however, is not part of a CBC. PT is a specific test that measures how long it takes blood to clot and assesses the extrinsic pathway of coagulation. While it is important for evaluating bleeding disorders and monitoring anticoagulant therapy, it is classified separately from a CBC and is conducted for different diagnostic purposes.

Thus, the presence of hematocrit, hemoglobin, and platelet count within the CBC panel confirms that these components are integral to understanding the general health and blood status of a patient. In contrast, PT serves a different function in the assessment of coagulation, which is why it is not included in a standard CBC test.