Also known as a full blood count, measures several components and features of your blood. This test gives information about the cells in a person's blood and evaluates your overall health detecting a wide range of disorders, including anemia, infection and leukemia. The normal range for a red blood cell count is 4.5 to 5.5 million cells/mm3. CBC results help to diagnose infections, inflammation, cancer, leukemia, autoimmune conditions (diseases in which the body's immune system attacks the body), bone marrow failure, abnormal development of bone marrow, anemia etc. CBC reports say about the reference range and your results. If the results are inside the reference range, they are considered as normal and if results are higher or lower than the reference range, they are considered as abnormal.
The test is done by collecting blood from your arm using a sterile needle. It is then collected in a vacutainer and then sent to the testing lab for further analysis.