What is a Complete Blood Count (CBC) Test?
The Complete Blood Count (CBC) is one of the most commonly ordered blood tests in medicine. It evaluates the cellular components of your blood — red blood cells, white blood cells and platelets — providing a comprehensive snapshot of your overall health. A CBC is used to screen for anaemia, infections, blood disorders, immune system problems and medication side effects. It is a routine part of every annual health checkup and is ordered alongside almost every diagnostic workup.
Key Parameters Tested in a CBC
A standard CBC panel includes 19–25 parameters across three blood cell lines:
Red Blood Cell (RBC) Parameters
- RBC Count — total number of red blood cells per microlitre of blood
- Haemoglobin (Hb) — the iron-rich protein that carries oxygen. The primary marker for anaemia diagnosis.
- Haematocrit (PCV) — the proportion of blood volume occupied by red cells
- MCV (Mean Corpuscular Volume) — average size of red cells. Small cells (microcytic) suggest iron deficiency; large cells (macrocytic) suggest B12 or folate deficiency.
- MCH (Mean Corpuscular Haemoglobin) — average amount of haemoglobin per red cell
- MCHC (Mean Corpuscular Haemoglobin Concentration) — concentration of haemoglobin in red cells
- RDW (Red Cell Distribution Width) — variation in red cell size; elevated in mixed anaemia or early deficiency
White Blood Cell (WBC) Parameters
- Total WBC Count — total white blood cell count. Elevated in infection or inflammation; low in some viral infections and bone marrow disorders.
- Neutrophils — the primary defence against bacterial infection. Elevated in bacterial infections.
- Lymphocytes — fight viral infections. Elevated in viral illness; low in HIV.
- Monocytes — involved in chronic infections and inflammatory conditions
- Eosinophils — elevated in allergic conditions and parasitic infections
- Basophils — rare; elevated in some blood disorders
Platelet Parameters
- Platelet Count — essential for blood clotting. Low platelets (thrombocytopenia) cause bruising and bleeding risk; high platelets (thrombocytosis) increase clotting risk.
- MPV (Mean Platelet Volume) — average platelet size; elevated when platelet production is increased
- PDW (Platelet Distribution Width) — variation in platelet size
Normal CBC Reference Ranges
| Parameter | Men | Women |
|---|---|---|
| Haemoglobin (Hb) | 13.5 – 17.5 g/dL | 12.0 – 15.5 g/dL |
| RBC Count | 4.5 – 5.9 million/μL | 4.0 – 5.2 million/μL |
| Haematocrit (PCV) | 41 – 53% | 36 – 46% |
| MCV | 80 – 100 fL | |
| Total WBC Count | 4,000 – 11,000 /μL | |
| Neutrophils | 40 – 70% | |
| Lymphocytes | 20 – 40% | |
| Eosinophils | 1 – 6% | |
| Platelet Count | 1.5 – 4.0 lakh /μL | |
What CBC Results Can Reveal
- Low Hb + Low MCV + Low MCH — Iron deficiency anaemia. Most common anaemia in India, especially in women and children.
- Low Hb + High MCV — Megaloblastic anaemia. Caused by Vitamin B12 or Folate deficiency.
- Low Hb + Normal MCV — Anaemia of chronic disease, kidney disease or early mixed deficiency.
- High WBC + High Neutrophils — Bacterial infection or inflammation.
- High WBC + High Lymphocytes — Viral infection (dengue, infectious mononucleosis).
- Low WBC (Leukopenia) — Viral infection (dengue, typhoid), bone marrow suppression, some medications.
- High Eosinophils — Allergic conditions (asthma, eczema) or parasitic infection.
- Low Platelets (Thrombocytopenia) — Dengue fever (most common in Kolkata monsoon), ITP, aplastic anaemia.
- Very High WBC (Leukocytosis) — Severe infection, leukaemia or bone marrow disorders.
When is a CBC Test Recommended?
Your doctor may recommend a CBC if you experience:
- Fatigue, weakness or pallor (possible anaemia)
- Fever or suspected infection
- Easy bruising or bleeding (possible platelet disorder)
- Swollen lymph nodes
- Unexplained weight loss
- Monitoring dengue fever (daily platelet count)
- As part of a routine health checkup or full body checkup package
- Pre-surgical screening
- Monitoring of chemotherapy or medications affecting blood counts
- Screening for blood disorders in pregnancy
CBC Test Price in Kolkata
No fasting required | Same-day results | Free home collection above ₹2,000
Tests Commonly Ordered Alongside CBC
- Peripheral Blood Smear — microscopic examination of blood cells ordered when CBC shows abnormal values to identify cell morphology abnormalities
- Iron Studies (Serum Iron, Ferritin, TIBC) — ordered when CBC shows microcytic anaemia to confirm iron deficiency
- Vitamin B12 & Folate — ordered when CBC shows macrocytic anaemia
- ESR (Erythrocyte Sedimentation Rate) — inflammation marker ordered alongside CBC
- CRP (C-Reactive Protein) — acute inflammation marker ordered with CBC in infection workup
- Dengue NS1 + IgM/IgG — ordered alongside CBC during monsoon fever with platelet drop
- Reticulocyte Count — assesses bone marrow response to anaemia
- HbA1c & Blood Sugar — frequently ordered alongside CBC in routine health checkups
Home Collection for CBC Test in Kolkata
Apollo Diagnostics provides home blood sample collection for CBC tests across Nagerbazar, Dum Dum, South Dum Dum and surrounding North and Central Kolkata areas. No fasting is required. Our phlebotomists arrive at your doorstep with sterile EDTA tubes and same-day results are available for most morning collections.
- Home collection available: 7:00 AM – 2:30 PM Daily
- No fasting required — book any time
- Same-day digital reports via WhatsApp
- Free home collection on orders above ₹2,000
→ Apollo Diagnostics Nagerbazar → Full List of Individual Tests → Book Home Collection → Full Body Checkup Packages
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