It is one of the most frequently ordered blood tests in medical practice and is used for various purposes, including diagnosing medical conditions, monitoring health, and assessing the effects of treatments. Here's an overview of what a CBC includes and what it can reveal: Red Blood Cell (RBC) Count, Hemoglobin (Hb) Concentration, Hematocrit (Hct) Level, White Blood Cell (WBC) Count, Differential White Blood Cell Count, Platelet Count etc.