Coagulation diagnostics Flashcards

1
Q

Prothrombin time (PT)

A
  • time it takes plasma to clot when exposed to tissue factor
  • assess extrinsic
  • measures effectiveness of warfarin
  • normal= 11-13
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2
Q

INR therapeutic level

A

2-3 seconds

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3
Q

aPTT

A

-measures the time it takes plasma to clot when exposed to substances that activate contact factors
- assesses intrinsic
- evaluates heparin
WNL: 25-38 seconds
-can shift so heparin XA may be standard

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4
Q

normal platelet count

A

150,000-400,000

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