Platelets are tiny cell fragments that clump together to stop bleeding. The platelet count is part of a standard CBC, with a typical adult range of about 150,000 to 450,000 per microliter.
Low platelets (thrombocytopenia)
A low count can increase the risk of easy bruising or bleeding. Causes include viral infections (such as dengue), certain medications, immune conditions, liver disease and bone marrow disorders. Very low counts need prompt medical review.
High platelets (thrombocytosis)
A high count is most often reactive — a temporary response to infection, inflammation, iron deficiency or recent surgery. Less commonly it reflects a bone marrow condition that needs specialist assessment.
Putting it in context
Mild changes are common and frequently resolve on their own. Your doctor will look at the trend and at related values such as your white cell count and hemoglobin before deciding whether anything further is needed.
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This article is for general education only and is not medical advice. Reference ranges vary between laboratories — always read your result against the range on your own report and discuss it with your doctor.