Lab reference

PT

Coagulation

For education. Check every result.

Anatium is a study resource, not medical advice. Nothing here is a diagnosis, a prescription or a substitute for a clinician who has seen the patient. Check every number against a current local protocol before it touches anyone, and never act on a result you cannot reproduce yourself.

Reference range

Range11 to 13.5 seconds

About

Prothrombin time, testing the extrinsic pathway. Prolonged by warfarin, liver disease and vitamin K deficiency.

When it is low

Hypercoagulable state (rare)

When it is high

Warfarin therapy, liver disease, vitamin K deficiency, DIC

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