Prothrombin Time
Prothrombin time is the number of seconds plasma takes to clot through the extrinsic pathway.
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Normal ranges
Adults: 11–15 s.
Units: s
Causes of deviations
Low levels:
Usually has no meaning.
High levels:
Vitamin K deficiency, liver disease, anticoagulants.
When to see a doctor
If the value is outside the range, discuss it with your doctor.
Related biomarkers
Panels
Coagulation panel
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