Coagulation Testing- PT units
Prothrombin Time assay (PT) cont’d:
Reported
units:
Used
to monitor therapy of:
Time to clot in seconds
(10.0 – 12.9 sec.)
INR = International Normalized Ratio
Oral anticoagulants (coumadin)
INR = 2.0 – 2.5 for coumadin therapy
INR =2.5 – 3.5 for valve replacement
INR = >4.0 risk of hemorrhaging
