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Test Code PTT PARTIAL THROMBOPLASTIN TIME

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Specimen Stability

4 hours as whole blood
Up to 2 weeks if plasma is frozen within 4 hours of collection

Rejection Reasons

Underfilled
Platelet-rich plasma (inadequate centrifugation)

Reference Range

0-3 months: 29.0-48.0 sec
3 months -17 years: 22.0-37.0 sec
17 years and older: 25.1-36.5 sec

Critical Value

101.0 seconds

CptCode

85730