This is probably a very stupid question, but could someone please tell me the difference between a PT (Prothrombin) Test and a PT-INR?
I found the PT test in my diagnostic/lab handbook, but can't find the other one and I need to hand in a paper giving the clinical and nursing significance of both. Is there some other name that PT-INR goes by?
Thanks ahead of time for indulging my probably very silly question....
Feb 27, '04
PT/INR are one in the same. They are usually a simultaneous lab test. The PT is the Prothrombin time and the INR is the ratio. If a patient is in a-fib and on Coumadin docs like to see and INR between 2.0 - 3.0. The PT result that you get is the amount of seconds it takes for a clot to form in the tube that the blood was collected in. If the INR is less than 2.0 they will increase the dose of Coumadin, if it is greater than 3.0 they will lower the dose. But remember, this all depends on the patient. If the patient had heart valve surgery they will want the INR a little higher. Hope this helps!
Last edit by Surgical Hrt RN on Feb 27, '04