What is a CBC?
A Complete Blood Count (CBC) is a blood test used to evaluate overall health and detect a wide range of disorders, including anemia, infection, and many other diseases. It measures several components of blood, including red blood cells, white blood cells, hemoglobin, hematocrit, and platelets.
Purpose of the Test
- Check for anemia or polycythemia
- Identify infections
- Detect blood cancers and disorders
- Monitor medical conditions and treatments
- Evaluate overall health during routine checkups
Preparation
- No special preparation is usually needed.
- Your doctor may advise fasting if CBC is combined with other tests.
- Inform your doctor about medications, as some may affect results.
Procedure
- A healthcare provider collects a blood sample, usually from a vein in your arm.
- The process typically takes only a few minutes.
- The blood sample is sent to a laboratory for analysis.
Results & Interpretation
The CBC provides information about:
- Red Blood Cells (RBC): Number and size can indicate anemia or other conditions.
- White Blood Cells (WBC): High levels may indicate infection; low levels can suggest bone marrow issues.
- Hemoglobin (Hb): Measures oxygen-carrying capacity of blood.
- Hematocrit (Hct): Percentage of red blood cells in blood.
- Platelets: Help with blood clotting.
Interpretation of CBC results should always be done by a qualified healthcare professional.
Risks
- Mild pain or bruising at the puncture site
- Very rare: excessive bleeding, infection, fainting
FAQs
- How long for results? Usually within 24 hours.
- Can CBC detect cancer? It can suggest abnormalities but is not a definitive cancer test.
Disclaimer
This page is for educational purposes only and is not a substitute for medical advice. Always consult your healthcare provider for diagnosis and treatment.