Interpreting a Complete Blood Count (CBC)

Components of a CBC and Their Clinical Significance

Hemoglobin (Hb) and Hematocrit (Hct) measure oxygen-carrying capacity, with low values indicating anemia and high values suggesting polycythemia, according to the American Diabetes Association 1
Red Blood Cell Count (RBC) quantifies the number of red blood cells, with abnormalities potentially indicating bone marrow disorders, bleeding, or hemolysis, as noted by the National Comprehensive Cancer Network 2
Mean Corpuscular Volume (MCV) measures average RBC size, helping to classify anemias as microcytic, normocytic, or macrocytic, with microcytic anemia commonly due to iron deficiency, thalassemia, or anemia of chronic disease, as reported by the National Comprehensive Cancer Network 2
Platelet Count measures cells involved in clotting, with low counts increasing bleeding risk and high counts potentially indicating inflammation or myeloproliferative disorders, according to the World Journal of Emergency Surgery 3

Assessing for anemia or polycythemia using Hemoglobin (Hb) and Hematocrit (Hct) values is crucial, with the National Comprehensive Cancer Network recommending the use of MCV to classify anemia type 2