Normal range 150-400 10³/µL (150-400 10⁹/L SI). Specimen: Whole blood (EDTA).
Also known as: thrombocyte count, PLT.
150-400 10³/µLCritical value: read below
Reference range
Conventional10³/µL
150400
SI10⁹/L
150400
Combined adult band. LabVals does not publish separate men's, women's, or pediatric ranges for Platelet Count; those can be narrower than the band shown.
Platelet Count reference range, specimen, and conversion details
Convert any Platelet Count result between units on the unit converter.
What is the normal range for Platelet Count?
The standard teaching reference range for Platelet Count is 150-400 10³/µL in conventional units, or 150-400 10⁹/L in SI units. This value is measured in whole blood (edta).
What is a critical Platelet Count value?
For Platelet Count, the commonly taught critical (panic) value is: < 50 × 10⁹/L (bleeding risk) - spontaneous bleeding risk rises sharply < 20; > 1,000. Critical results are reported to the provider immediately under your facility's policy.
Source: Adult reference values compiled from Pagana & Pagana, Mosby's Diagnostic and Laboratory Test Reference, and Fischbach & Dunning, A Manual of Laboratory and Diagnostic Tests. Reference ranges vary by laboratory, method, age, sex, and population - always use the range printed on the actual result.
Above the range
What causes a high Platelet Count?
Reactive thrombocytosis (infection, inflammation, iron deficiency)
Institute bleeding precautions when counts fall (typically < 50 × 10⁹/L).
Hold anticoagulants and avoid IM injections with severe thrombocytopenia per orders.
Suspect HIT when platelets fall ~50% several days after heparin exposure.
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