15 values
CBC Test: What Each Value on a Blood Count Means
A complete blood count — hemogram, CBC — is the most commonly ordered blood test there is, and the most intimidating to receive, because it prints fifteen-odd lines where other panels print five. Almost all of it describes three things: your red cells, your white cells and your platelets.
When it is ordered
Ordered for fever, tiredness, before surgery, in pregnancy, and as part of most routine check-ups. No fasting is required.
Every line on the report
| Test | Typical range | Unit | What it is |
|---|---|---|---|
| Hemoglobin | 12–15 (F) · 13–17 (M) | g/dL | The protein that carries oxygen. The headline number of a blood count, and the one that defines anaemia. |
| RBC Count | 3.8–4.8 (F) · 4.5–5.5 (M) | 10^6/µL | How many red cells are circulating. Read with hemoglobin and MCV rather than alone. |
| PCV (Hematocrit) | 36–46 (F) · 40–50 (M) | % | The share of blood made up of red cells. Falls in anaemia; rises when you are short of fluid. |
| MCV | 80–100 | fL | The average size of a red cell — the single most useful clue to the cause of anaemia. Small cells point at iron; large ones at B12 or folate. |
| MCH | 27–32 | pg | The average amount of hemoglobin in each red cell. Moves with MCV and adds little on its own. |
| MCHC | 32–36 | g/dL | How concentrated the hemoglobin is inside the cells. Rarely acted on by itself. |
| RDW | 11.5–14.5 | % | How much red-cell sizes vary. A raised RDW often appears early in iron deficiency, before other values move. |
| Total WBC Count | 4–10 | 10^3/µL | The immune system's working population. Rises with infection and inflammation. |
| Neutrophils | 40–80 | % | The largest white-cell group, and the first responders to bacterial infection. |
| Lymphocytes | 20–40 | % | The white cells that handle viral infection; often relatively raised when neutrophils are not. |
| Eosinophils | 1–6 | % | Raised in allergy and in parasitic infection — both common reasons in India. |
| Monocytes | 2–10 | % | Clean-up cells. A modest rise accompanies many long-running infections. |
| Basophils | up to 2 | % | Present in very small numbers; a value at or near zero is normal. |
| Platelet Count | 150–410 | 10^3/µL | The cells that clot. Watched closely in dengue season, where the trend across days matters more than one reading. |
| MPV | 7.5–11.5 | fL | The average platelet size. Interpreted alongside the count, not instead of it. |
Ranges differ between laboratories. These are the values commonly printed on adult reports in India — always compare against the range printed on your own report, next to your own result.
How the values are read together
- Red cells — hemoglobin says whether you are anaemic; MCV and RDW suggest why. Small cells with a raised RDW point at iron; large cells point at B12 or folate.
- White cells — the total says the immune system is responding; the differential beneath it says to what. Neutrophils lead in bacterial infection, lymphocytes in viral, eosinophils in allergy and parasites.
- Platelets — a single low reading in a well person means much less than a falling trend in someone with fever.
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Frequently asked questions
Do I need to fast for a CBC test?
No. A blood count does not require fasting. If it is being done alongside a sugar or lipid test, follow the fasting instruction for those.
Which value in a CBC matters most?
It depends on why the test was ordered, but hemoglobin, the total white count and the platelet count carry most of the weight. The rest of the lines mainly explain those three.
My CBC has one value slightly outside the range — is that serious?
Usually not. Reference ranges are built so that some healthy people fall outside them, and a blood count has fifteen chances to do that. A doctor reads the pattern, not the single flag.