Quick answer
A CBC report shows haemoglobin (normal: men 13–17 g/dL, women 12–15 g/dL), white blood cells (4,000–11,000/µL) and platelets (1.5–4.5 lakh/µL). Low haemoglobin means anaemia, high WBC often means infection, and low platelets need prompt review during fever.
Red blood cell section
- Haemoglobin (Hb) — carries oxygen. Low Hb = anaemia.
- RBC count — number of red cells.
- PCV/Haematocrit — percentage of blood made up of red cells.
- MCV — average size of red cells. Small (low MCV) suggests iron deficiency; large (high MCV) suggests B12/folate deficiency.
- MCH and MCHC — amount and concentration of haemoglobin in each cell.
White blood cell section
- Total WBC count — high in bacterial infection and inflammation, sometimes low in viral infection.
- Neutrophils — fight bacteria.
- Lymphocytes — fight viruses.
- Eosinophils — rise in allergies and worm infections.
- Monocytes and basophils — smaller roles in immunity and inflammation.
Platelet count
Platelets help blood clot. A normal count is 1.5–4.5 lakh/µL. A falling platelet count during fever — especially in the monsoon — is a warning sign that needs medical attention.
Frequently asked questions
Does CBC need fasting?
No. A CBC can be done at any time without fasting.
Which CBC values indicate infection?
A raised total WBC count with high neutrophils usually suggests a bacterial infection.
Medical disclaimer: This information is for general awareness only and is not a substitute for professional medical advice. Please consult a qualified doctor to interpret your results and before starting or changing any treatment.