A Complete Blood Count (CBC) is a common blood test used to assess overall health and provide important information about the cells circulating in your blood. It measures red blood cells, white blood cells, platelets, hemoglobin, hematocrit and other blood cell parameters.
What Does a CBC Test Check?
A CBC blood test helps evaluate red blood cells that carry oxygen, white blood cells involved in immune defense, and platelets that support normal blood clotting. Healthcare professionals may recommend a CBC as part of a routine health checkup or when investigating symptoms such as tiredness, weakness, fever, unexplained bruising or bleeding.
Why Is a CBC Test Recommended?
A CBC can help identify changes associated with conditions such as anemia, infections, blood disorders and immune system problems. It may also be used to monitor an existing condition or assess changes during certain treatments. An abnormal result does not automatically mean that a disease is present; your doctor will interpret the results alongside your symptoms, medical history and other tests.
CBC Test Preparation and Procedure
Usually, no special preparation is required for a CBC. If other blood tests are ordered at the same time, fasting may sometimes be necessary. A healthcare professional collects a small blood sample, typically from a vein in the arm. The procedure usually takes only a few minutes, and normal activities can generally be resumed afterward.