How is a CBC test performed?

A CBC test is a simple and quick procedure. A healthcare provider will draw a small blood sample, typically from a vein in your arm. The blood is then sent to a laboratory where automated machines count the different components of your blood, including red blood cells, white blood cells, and platelets. The process itself takes only a few minutes and is generally painless, though some individuals may experience slight discomfort when the needle is inserted. Results are usually available within a few hours to a day, depending on the lab, and your doctor will use these results to assess your overall health.