CBC Test Results Explained: Hemoglobin, WBC and Platelets
Understand your complete blood count: hemoglobin, red cells, MCV, white cells, differential and platelets, with typical ranges and what high or low means.
By Browser Tools Team · · 3 min read
A complete blood count (CBC) measures the three kinds of cells in your blood: red cells, which carry oxygen; white cells, which fight infection; and platelets, which help blood clot. The most important lines are hemoglobin, white blood cells (WBC or TLC) and platelets. Results just outside the range are common; patterns matter more than single numbers.
To see where your numbers fall, paste your report into the free CBC Test Checker. It understands common report formats, including "lakh/cumm" and "cells/cumm", and runs in your browser.
What does each part of a CBC mean?
A CBC has three groups of results.
Red blood cells
| Test | What it shows | Typical adult range |
|---|---|---|
| Hemoglobin (Hb) | Oxygen-carrying protein | Men 13.5–17.5 g/dL, women 12.0–15.5 g/dL |
| Hematocrit (PCV/HCT) | Share of blood made of red cells | Men 40–50%, women 36–44% |
| RBC count | Number of red cells | Men 4.5–5.9, women 4.1–5.1 million/µL |
| MCV | Average red cell size | 80–100 fL |
| MCH / MCHC | Hemoglobin per cell | 27–33 pg / 32–36 g/dL |
| RDW | Variation in cell size | 11.5–14.5% |
White blood cells
| Test | Typical range |
|---|---|
| Total WBC (TLC) | 4.0–11.0 ×10³/µL (4,000–11,000 cells/cumm) |
| Neutrophils | 40–70% |
| Lymphocytes | 20–40% |
| Monocytes | 2–8% |
| Eosinophils | 1–6% |
| Basophils | 0–1% |
Platelets: typically 150–450 ×10³/µL, which is 1.5–4.5 lakh/cumm.
Hemoglobin of 13.5 g/dL is the same as 135 g/L. Ranges vary by lab, age and sex, so compare with your own report first.
What does low hemoglobin mean?
Low hemoglobin is called anaemia. It's very common, especially in women and in South Asia. The most frequent causes are low iron (from diet, heavy periods or slow blood loss), low vitamin B12 or folate, and long-term illness. Red cell size helps narrow it down:
- Low MCV (small cells): often iron deficiency or thalassaemia trait.
- High MCV (large cells): often low B12 or folate, alcohol, liver or thyroid problems.
- Normal MCV: recent blood loss, kidney disease or chronic illness.
Don't start iron tablets without checking with a doctor, because some causes need a different treatment. Iron-rich foods are covered in our diet plans for health conditions.
High hemoglobin can come from dehydration, smoking or living at altitude, and less often from a bone-marrow condition.
What do white blood cell results mean?
A raised WBC most often means your body is fighting an infection or inflammation. Neutrophils tend to rise with bacterial infections, lymphocytes with viral ones, and eosinophils with allergies, asthma or parasites. Stress, recent exercise, smoking and steroid medicines also raise counts.
A low WBC can follow a viral infection, and some medicines and conditions lower it. A very low neutrophil count raises the risk of infection, so a fever with low neutrophils needs prompt medical care.
What do platelet results mean?
Low platelets (thrombocytopenia) can follow viral infections (including dengue, a common reason platelets are checked), some medicines, heavy alcohol use and liver disease. High platelets often follow infection, inflammation, iron deficiency or surgery.
Very low platelets, especially below 20 ×10³/µL, or any unexplained bleeding, bruising or tiny red spots on the skin, need urgent medical attention.
How do I check my CBC with the tool?
- Open the CBC Test Checker.
- Choose Paste report, Upload PDF (digital lab PDFs only, not scans or photos) or Enter values.
- Set your sex and age so the right hemoglobin range is used.
- Read each result's status (Normal, Borderline or Out of range), the range bar, the explanation and the questions to ask your doctor. A red banner appears if any value is far outside the usual range.
When should I see a doctor?
See a doctor about any flagged CBC, especially if you have tiredness, breathlessness, fever, bleeding, bruising or weight loss. Seek same-day care for very low hemoglobin, very low platelets, or a fever with a low white count.
Read more in how to read a blood test report, or check your CBC now.
Frequently asked questions
What is a normal hemoglobin level?
Typical adult ranges are about 13.5–17.5 g/dL for men and 12.0–15.5 g/dL for women, though each lab's range differs slightly. Below the range is called anaemia.
What does a high white blood cell count mean?
Most often an infection or inflammation, but stress, smoking, some medicines such as steroids, and recent exercise can raise it too. Very high or persistently raised counts need a doctor's review.
What platelet count is dangerous?
A typical count is 150–450 ×10³/µL (1.5–4.5 lakh/cumm). Very low counts, especially below 20 ×10³/µL, raise bleeding risk and need urgent medical attention, as can bleeding or bruising at any low count.
What is MCV on a CBC?
MCV is the average size of your red blood cells, typically 80–100 fL. Small cells often point to low iron or thalassaemia trait; large cells can point to low B12 or folate, alcohol or thyroid problems.
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