INR Blood Clotting Testing

A Top Ranked Manhattan M.D. Explains: What is an “INR” Test?

Your Upper East Side doctor, Dr. Marina Gafanovich, can provide a more detailed explanation in person regarding an “INR” test, but essentially an “INR” test (internal normalized ratio test) is simply a test that measures the extrinsic pathway of blood coagulation in the human body.  The evaluator is attempting to derive the “prothrombin time” (PT) from tests performed against blood plasma.  This means that the blood that is drawn from your body must be separated into blood cells and blood plasma before the test can be performed.  This is done using citrate to bind the calcium within the blood and then entire vial is centrifuged to separate cells from plasma.  Once this has been performed, our staff will then add calcium to the plasma mixture so that it can “clot” and INR measurements can be taken.

INR Blood Test appointment

There are many reasons why New York physician, Dr. Gafanovich, may recommend blood clotting tests to be performed.


Heart patients on warfarin may need to have monthly testing done to ensure the efficacy of the medication they are using to prevent heart problems.  Hemophiliacs by nature have blood clotting issues that must be continually monitored.  Also, issues with blood clotting can be a sign of organ malfunction.

Please call us (212) 249-6218 to schedule your appointment with Dr. Marina Gafanovich, MD.