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Platelets are tiny blood cell fragments that rush to damaged blood vessels to form the initial seal that stops bleeding. Too few platelets (thrombocytopenia) raises the risk of bruising and uncontrolled bleeding; too many (thrombocytosis) can increase the risk of dangerous blood clots. Abnormal platelet counts found on a standard CBC almost always warrant investigation into the underlying cause.
Also known as: Platelet, Platelet (Plt), Platelet Count, Platelets, Platelt, PLT, Plt Count, Thrb
High platelets can be reactive from infection, iron deficiency, or inflammation, or primary from myeloproliferative disorders. Low platelets result from bone marrow failure, autoimmune destruction, liver disease, or medications.
Standard range is 150-400 K/uL. Functional practitioners favor 200-300 K/uL. Platelets above 350 K/uL should prompt investigation for iron deficiency or chronic inflammation.