A CBC is a panel of tests that evaluates the three types of cells that circulate in the blood. A CBC includes the following: Evaluation of white blood cells, the cells that are part of the body's defense system against infections and cancer and also play a role in allergies and inflammation: White blood cell (WBC) count is a count of the total number of white blood cells in a person's sample of blood. White blood cell differential may or may not be included as part of the panel of tests. It identifies and counts the number of the various types of white blood cells present. The five types include neutrophils, lymphocytes, monocytes, eosinophils, and basophils. Evaluation of red blood cells, the cells that transport oxygen throughout the body, Red blood cell (RBC) count is a count of the actual number of red blood cells in a person's sample of blood, Hemoglobin measures the total amount of the oxygen-carrying protein in the blood, which generally reflects the number of red blood cells in the blood, Hematocrit measures the percentage of a person's total blood volume that consists of red blood cells, Red blood cell indices are calculations that provide information on the physical characteristics of the RBCs, Mean corpuscular volume (MCV) is a measurement of the average size of a single red blood cell. Mean corpuscular hemoglobin (MCH) is a calculation of the average amount of hemoglobin inside a single red blood cell, Mean corpuscular hemoglobin concentration (MCHC) is a calculation of the average concentration of hemoglobin inside a single red blood cell, Red cell distribution width (RDW) is a calculation of the variation in the size of RBCs. The CBC may also include reticulocyte count, which is a measurement of the absolute count or percentage of young red blood cells in blood, Evaluation of platelets, cell fragments that are vital for normal blood clotting. The platelet count is the number of platelets in a person's sample of blood. Mean platelet volume (MPV) may be reported with a CBC. It is a calculation of the average size of platelets. Platelet distribution width (PDW) may also be reported with a CBC. It reflects how uniform platelets are in size.Complete blood count (CBC) is done as a routine work-up for broad screening to determine an individual's general health status. It can be used to screen for a wide range of conditions and diseases. It Helps diagnose various conditions, such as anemia, infection, inflammation, bleeding disorder or leukemia, Monitor treatment that is known to affect blood cells, such as chemotherapy or radiation therapy, Complete Blood Count (CBC)