A routine complete blood count (CBC) checks for levels of 10 different components of every major cell in your blood: white blood cells, red blood cells, and platelets.
A complete blood count (CBC) is a blood test used to evaluate your overall health and detect a wide range of disorders, including anemia, infection and leukemia.
A complete blood count test measures several components and features of your blood, including:
- Red blood cells, which carry oxygen
- White blood cells, which fight infection
- Hemoglobin, the oxygen-carrying protein in red blood cells
- Hematocrit, the proportion of red blood cells to the fluid component, or plasma, in your blood
- Platelets, which help with blood clotting
Important components this test measures include red blood cell count, hemoglobin, and hematocrit.
Here’s the typicalTrusted Source range of results, although every laboratory may have its own range that varies slightly:
|red blood cells (cells responsible for carrying oxygen throughout the body)||male: 4.3–5.9 million/mm3; female: 3.5–5.5 million/mm3|
|white blood cells (immune system cells in the blood)||4,500–11,000/mm3|
|platelets (the substances that control the clotting of the blood)||150,000–400,000/mm3|
|hemoglobin (protein within the red blood cells that carries oxygen to organs and tissues, and carbon dioxide back to the lungs)||male: 13.5–17.5 grams/deciliter (g/dL); female: 12.0–16.0 g/dL|
|hematocrit (percentage of blood made of red blood cells)||male: 41–53%; female: 36–46%|
Abnormal levels of these components may indicate:Trusted Source
- nutritional deficiencies, such as vitamin B6 or B12
- anemia (iron deficiency)
- clotting problems
- blood cancer
- immune system disorders
Based on your results, your doctor will order follow-up tests to confirm abnormal levels and a possible diagnosis.
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