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A Complete Blood Count (CBC) is one of the most common and essential blood tests performed to evaluate overall health. It measures several components and features of blood including Red Blood Cells (RBCs), White Blood Cells (WBCs), Hemoglobin, Hematocrit, and Platelets.
Doctors commonly use CBC to diagnose conditions like anemia, infection, inflammation, bleeding disorders, immune system problems, and monitor the effectiveness of treatment.
RBCs carry oxygen from the lungs to all body tissues.
Low RBC → Anemia, nutritional deficiency, blood loss
High RBC → Dehydration, smoking, lung or heart diseases
Hemoglobin is the protein in RBCs responsible for oxygen transport.
Normal Range
Men: 13–17 g/dL
Women: 12–15 g/dL
Low Hemoglobin → Anemia, chronic disease, bleeding
High Hemoglobin → Dehydration,altitude, lung diseases
Percentage of blood volume made up of RBCs.
Low HCT → Anemia, malnutrition
High HCT → Dehydration, smoking
WBCs fight infection and support the immune system.
Normal Range: 4,000 – 11,000/µL
High WBC → Infection, inflammation, stress, leukemia
Low WBC → Viral infection, autoimmune disease, bone marrow disorder
Help in blood clotting and prevent bleeding.
Normal Range: 150,000 – 450,000/µL
Low Platelets (Thrombocytopenia) → Dengue, viral illness, bleeding disorders
High Platelets (Thrombocytosis) → Inflammation, risk of blood clots
These parameters help determine the type of anemia:
MCV = Size of RBC
MCH / MCHC = Amount of hemoglobin per RBC
| Reason | Purpose |
|---|---|
| Weakness or fatigue | Detect anemia |
| Fever or infection | Check increased WBC |
| Before surgery | Evaluate baseline health |
| Bleeding or bruising | Check platelet level |
| Monitor treatment | During chemotherapy, anemia treatment |
| Parameter | Normal Range |
|---|---|
| Hemoglobin | M: 13–17 g/dL, F: 12–15 g/dL |
| WBC | 4,000 – 11,000/µL |
| RBC | M: 4.5–5.9 million/µL, F: 4.0–5.1 million/µL |
| Platelets | 150,000–450,000/µL |
| Hematocrit | M: 41–50%, F: 36–44% |
| Finding | Possible Cause |
|---|---|
| Low Hemoglobin / RBC | Anemia, nutrition deficiency, bleeding |
| High WBC | Bacterial infection, inflammation, leukemia |
| Low WBC | Viral infection, bone marrow damage |
| Low Platelets | Dengue, viral infection, bleeding disorders |
| High Platelets | Blood clot risk, inflammation |
No fasting is required
Inform doctor about medications
If other tests are combined, fasting may be required
A Complete Blood Count (CBC) is a fundamental diagnostic test that provides critical information about blood health and overall body function. It helps detect early signs of diseases and guides treatment decisions. Doctors often recommend CBC as a routine test during fever, fatigue, weakness, infections, and pre-surgery evaluations.
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