This topic will help you understand the complete blood count test and how to prepare for it.

What is a Complete Blood Count (CBC) Test?

A complete blood count (CBC) is a blood test that measures various components and characteristics of the blood, such as:

Red blood cells

White blood cells

Platelets

Hemoglobin

Hematocrit

Mean corpuscular volume (MCV)

It is a common test and often a part of routine (periodic) examinations. A CBC test can help diagnose a range of disorders and problems, such as infections, anemia, immune system diseases, and blood cancers.

Normal Levels for Complete Blood Count:

| Normal Ranges for Complete Blood Count | Normal Ranges for Complete Blood Count | | — | — | | Red Blood Cell Count | Men: 4.35 to 5.65 trillion cells/L (4.35 to 5.65 million cells/mL) Women: 3.92 to 5.13 trillion cells/L (3.92 to 5.13 million cells/mL) | | Hemoglobin | Men: 13.2 to 16.6 grams/dL (132 to 166 grams/L) Women: 11.6 to 15 grams/dL (116 to 150 grams/L) | | Hematocrit | Men: 38.3 to 48.6% Women: 35.5 to 44.9% | | Platelet Count | Men: 135 to 317 billion/L (135,000 to 317,000/mL) Women: 157 to 371 billion/L (157,000 to 371,000/mL) | | White Blood Cell Count (WBC) | 3.4 to 9.6 billion cells/L (3,400 to 9,600 cells/mL) |

When is a Complete Blood Count Test Conducted?

Routine (periodic) examinations or during clinical check-ups are recommended when visiting your doctor.

You may need a CBC test if you have any of the following symptoms:

Bruising or bleeding

Fatigue or dizziness

Fever, nausea, and vomiting

Swelling and irritation anywhere in the body

Joint pains

Issues with heart rate or blood pressure

How to Prepare for a Complete Blood Count?

Usually, no special preparation is required for a complete blood count test.