Partial thromboplastin time

Partial thromboplastin time is a topic covered in the Guide to Diagnostic Tests.

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Test/Range/Collection

Partial thromboplastin time, activated, plasma (aPTT)

25–35 seconds

(laboratory-specific)

Panic: ≥60 seconds (off heparin)

Blue

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Do not contaminate specimen with heparin.

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