PT and INR
Also known as: Prothrombin Time; Pro Time; Protime
Formal name: Prothrombin Time and International Normalized Ratio
Related tests: Activated Clotting Time (ACT); Partial Thromboplastin Time (PTT); Prothrombin Consumption Time (PCT); Fibrinogen; Coagulation Factors; Platelet Count; Platelet Function Tests
At a Glance
Why Get Tested?
To check how well blood-thinning medications (anti-coagulants) are working to prevent blood clots; to help detect and diagnose a bleeding disorder
When to Get Tested?
If you are taking an anti-coagulant drug or if your doctor suspects that you may have a bleeding disorder
Sample Required?
A blood sample drawn from a vein in the arm; sometimes blood from a fingerstick
Test Preparation Needed?
None needed, although if you are receiving anticoagulant therapy, the specimen should be collected before taking your daily dose.
