Complete Blood Count (CBC)

What is Complete Blood Count (CBC)?

A Complete Blood Count (CBC) is one of the most common blood tests. It measures red blood cells, white blood cells, hemoglobin, hematocrit, and platelets to give a snapshot of your overall health.

What are the uses of a CBC test?

Doctors order a CBC to screen for infections, anemia, inflammation, clotting problems, and to monitor treatment response.

When should I get a CBC test?

You may need a CBC if you have unexplained fatigue, fever, bruising, frequent infections, or as part of a routine health check-up.

• Unexplained fatigue or weakness
• Persistent fever
• Easy bruising or bleeding
• Routine annual screening

What are the requirements of a CBC test?

A small blood sample is drawn from a vein in your arm. The procedure takes only a few minutes.

CBC test procedure

A trained phlebotomist cleans the skin, inserts a needle, collects blood into a tube, applies pressure, and labels the sample for laboratory analysis.

• The collection site is cleaned with antiseptic
• A needle is inserted into a vein
• Blood is collected into labeled tubes
• Pressure is applied and a bandage is placed

What do the results from a CBC test mean?

Your report compares each value to reference ranges. Abnormal counts may indicate infection, anemia, or other conditions that your doctor will interpret alongside your symptoms.