What this test measures
Platelets (thrombocytes) are small cell fragments produced by megakaryocytes in the bone marrow. Their main job is to form the initial plug at any site of vascular injury, stopping bleeding within seconds. The platelet count is the number of platelets per microlitre of blood. Adult normal range is 150,000–450,000 / µL (1.5–4.5 lakh in Indian reports).
Low platelets (thrombocytopenia) increase bleeding risk; very low counts (<20,000) can cause spontaneous bleeding. High platelets (thrombocytosis) increase clotting risk if persistently above 1,000,000. The count is reported standalone or as part of a CBC. Most modern Indian labs report platelet count along with MPV (mean platelet volume), which reflects the size and activity of the platelets.
Why it matters
Platelet count is the single most important number to track in dengue fever — Mumbai sees thousands of dengue cases each monsoon, and serial platelet monitoring guides supportive care and inpatient admission decisions. Platelet count is also critical before any surgery, in patients on chemotherapy or immunosuppressants, and in pregnancy (where mild thrombocytopenia is common and gestational thrombocytopenia must be distinguished from preeclampsia/HELLP).
For adults with bleeding symptoms (gum bleeding, easy bruising, heavy menses, petechiae), low platelets is one of the first things to check. The cause matters more than the number — dengue, ITP, drug-induced, liver disease, B12/folate deficiency, marrow failure, and TTP/HUS all need different treatments.
How to prepare
No fasting required. Inform the lab if you are on aspirin, clopidogrel, anticoagulants (warfarin, DOACs, heparin), chemotherapy, or have had a recent infection. EDTA-induced pseudothrombocytopenia is a lab artefact — if your platelet count is unexpectedly low, the test may be repeated with a citrate tube to confirm.
Markers & reference ranges
Reference ranges below are typical adult values. Your lab's reported range may differ slightly based on the assay platform and patient demographics — always read your report against the range printed on it.
| Marker | Normal range | If low | If high |
|---|---|---|---|
| Platelet Count (×10⁹/L (or per µL))[1][2] | 150–450 (1.5–4.5 lakh/µL) | Thrombocytopenia. Causes (Indian context): dengue, viral fevers, malaria, ITP, liver disease with hypersplenism, sepsis, B12/folate deficiency, drug-induced (heparin, vancomycin), and pregnancy (gestational thrombocytopenia, preeclampsia/HELLP). Bleeding risk significant <50,000; spontaneous bleeding <20,000. | Thrombocytosis. Reactive (after infection, blood loss, iron deficiency, inflammation, post-splenectomy) — usually self-limiting. Primary (essential thrombocythaemia or other myeloproliferative disorders) — persistent values >600,000 warrant haematology evaluation. Risk of thrombosis rises with persistent values >1,000,000. |
| MPV (Mean Platelet Volume) (fL) | 7.5–11.5 | Low MPV — production defect (aplastic anaemia, chemotherapy, Wiskott-Aldrich syndrome). | High MPV — increased platelet turnover (ITP, dengue recovery, post-splenectomy, myeloproliferative disorders). Large young platelets are more haemostatically active. |
Platelet count interpretation and bleeding risk
| Platelet count (per µL) | Status | Clinical implication |
|---|---|---|
| > 450,000 | Thrombocytosis | Reactive (most common) or primary (rare). Investigate if persistent. |
| 150,000 – 450,000 | Normal | No bleeding/clotting risk from platelets |
| 100,000 – 150,000 | Mild thrombocytopenia | No significant bleeding risk; investigate if persistent |
| 50,000 – 100,000 | Moderate thrombocytopenia | Surgery / dental work needs caution |
| 20,000 – 50,000 | Significant thrombocytopenia | Spontaneous bleeding rare; avoid invasive procedures |
| < 20,000 | Severe thrombocytopenia | Spontaneous bleeding risk; consider platelet transfusion |
| < 10,000 | Critical | Platelet transfusion usually indicated |
Frequently asked questions
Do I need to fast?
No.
My platelets are 80,000 — should I be worried?
80,000 is mildly low. Common causes include recent viral fever (dengue, COVID), drug effects, or ITP. Most people at this count do not have spontaneous bleeding, but consult your doctor — the cause matters more than the number.
When do platelets need to be transfused?
Usually only when count is below 10,000 (or 20,000 with risk factors), or below 50,000 before surgery, or when there is active significant bleeding. In dengue, transfusion is only indicated for bleeding — not just for low count.
How quickly can my platelet count change?
Very quickly. In dengue, platelets can drop from 200,000 to 20,000 within 48 hours and recover equally fast. Serial monitoring (daily during acute illness) is the right approach.
What is pseudothrombocytopenia?
A lab artefact where platelets clump in the EDTA tube and the analyser undercounts. The patient is actually fine. If the count is unexpectedly low, the lab will examine the smear and repeat in citrate.
My platelets are 6 lakhs — what does that mean?
600,000 is moderately elevated. Most common cause in India is reactive thrombocytosis after recent infection, iron deficiency, or inflammation. Persistent values above 600,000 over multiple readings warrant haematology evaluation for essential thrombocythaemia or other myeloproliferative disorders.
Can my platelets be low because of medication?
Yes. Many drugs cause thrombocytopenia — heparin (HIT), quinine, sulfa drugs, vancomycin, valproate, and many chemotherapy agents. Always disclose all medications.
How is the report given?
Most labs report platelet count as cells × 10⁹/L (e.g. 250) or per µL (e.g. 2,50,000). Indian convention often uses lakh (e.g. 2.5 lakh). All are equivalent.
Related Hematology / Anemia tests
Tests commonly ordered alongside PLATELET COUNT, or that help interpret an unexpected result.
Sources & references
- NIH MedlinePlus — Platelet Tests · accessed 2026-05-30T00:00:00.000Z
- NCBI StatPearls — Thrombocytopenia · accessed 2026-05-30T00:00:00.000Z
- American Society of Hematology — Platelets · accessed 2026-05-30T00:00:00.000Z
- BSH — Adult ITP Guidelines · accessed 2026-05-30T00:00:00.000Z
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