A low platelet count (thrombocytopenia) usually means below 150 ×10⁹/L (150 K/µL, or 150,000 per microlitre). Mild drops, between about 100 and 150, are common, often temporary and rarely cause bleeding. The risk of bleeding rises mainly when platelets fall below about 50, and spontaneous bleeding is mostly a concern below 20–30.
| Category | Reference range |
|---|---|
| Adults | 150–400 ×10⁹/L (= K/µL in US reports) |
| Mild thrombocytopenia | 100–149 ×10⁹/L (= K/µL in US reports) |
| Moderate | 50–99 ×10⁹/L (= K/µL in US reports) |
| Severe | below 50 ×10⁹/L (= K/µL in US reports) |
Ranges vary slightly by lab; use the range printed on your report.
Platelets are small cell fragments made in the bone marrow. They plug small breaks in blood vessels and start the clotting process. A low count can happen because the marrow makes too few, because platelets are used up or destroyed faster than normal, or because the spleen holds on to more of them than usual.
Sometimes the low count is not real. Platelets can clump together in the sample tube (called pseudothrombocytopenia, often caused by the EDTA in the tube), and the analyser then undercounts them. If the result does not fit how you are, the lab may recheck it with a different tube or look at a blood film.
A count of 130 ×10⁹/L is mildly low. With normal haemoglobin and white cells, no bruising or bleeding, and no known liver problem, it is usually just watched: a repeat in a few weeks to months shows whether it is stable, rising or falling. Some people have a count in the 130s for years without any issue.
It is worth telling your doctor about alcohol intake, recent infections and all medicines and supplements, because these explain many mild drops.
Platelets fall gradually in many pregnancies. Gestational thrombocytopenia affects around 5–10% of pregnant women, is usually mild (often above 100) and goes back to normal after birth without affecting the baby. Your midwife or obstetrician will still check for less common causes, especially pre-eclampsia, if the drop is larger or comes with high blood pressure, headaches or swelling. Platelet levels also matter for decisions about epidural anaesthesia, so the team will keep an eye on them.
A mildly low count usually causes no symptoms at all. Signs that platelets may be significantly low include easy bruising, small red or purple spots on the skin (petechiae), nosebleeds or gum bleeding, and unusually heavy periods. Contact your GP or doctor promptly if you notice any of these. Seek emergency care (A&E, the emergency room or 999/911) if you have:
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No need to decode the numbers yourself: take a photo of the report and the app explains “Low platelet count” and the rest in plain words — what is normal and what deserves attention.
App StoreGoogle PlayWeb versionThat there are fewer clotting cells than usual, typically under 150 ×10⁹/L. Mild drops are often due to a recent virus, alcohol, medicines or pregnancy. Your doctor will look at the rest of the blood count and may repeat the test.
Bleeding after injury or surgery becomes more likely below about 50 ×10⁹/L, and spontaneous bleeding is mainly a concern below 20 to 30. Counts between 100 and 150 rarely cause problems on their own.
Everyday stress is not a recognised cause of a low platelet count. If your count is low, your doctor will look for a more specific reason such as an infection, a medicine or an immune cause.
Often none. When counts are quite low you may notice easy bruising, pinpoint red spots on the skin, nosebleeds, bleeding gums or heavy periods.
Yes, often. Drops after viral infections usually recover within weeks, and gestational thrombocytopenia resolves after birth. When a medicine or alcohol is the cause, counts usually improve once that factor is addressed with your doctor.
This material is for general information only. It is not a medical opinion and does not replace a consultation with a doctor. Reference ranges depend on the laboratory and the method — rely on the range printed on your own report. Your doctor makes the final interpretation.
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