Blood
PT/PTT are laboratory tests that measure the clotting time (how long it takes blood to clot.). PT/PTT are blood tests and INR is a ratio calculated from the PT. At least a dozen blood proteins, or blood clotting factors, are needed to clot blood and stop bleeding (coagulation). Prothrombin, or factor II, is one of several clotting factors produced by the liver. The INR stands for International Normalized Ratio. The INR is calculated from the PT and is intended to allow valid comparisons of results regardless of the type of PT reagent used among different laboratories (INR = [patient PT / mean normal PT]). PT is the abbreviation for “prothrombin time.” Prothrombin time is just a measure of how quickly your blood clots. INR is an abbreviation for “International Normalized Ratio.” This is the unit of measure that’s used to determine how quickly your blood is clotting. Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. A prothrombin time test can be used to check for bleeding problems. PT is also used to check whether medicine to prevent blood clots is working. A PT test may also be called an INR test. INR is the international normalized value for prothrombin time. It is a value that measures the extrinsic pathway of clotting, and is often used to determine how quickly the person will make clots. It is often used to determine if the patient is on therapeutic doses of blood thinners. Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. A prothrombin time test can be used to check for bleeding problems. PT is also used to check whether medicine to prevent blood clots is working. A PT test may also be called an INR test. The international normalized ratio (INR) is a standardized number that's figured out in the lab. If you take blood thinners, also called anti-clotting drugs or anticoagulants, it's especially important to check your INR. Prothrombin Time and INR. Guide. Prothrombin time (PT) is a blood test that measures how long it takes blood to clot. A prothrombin time test can be used to check for bleeding problems. PT is also used to check whether medicine to prevent blood clots is working. A PT test may also be called an INR test.
http://allnurses.com/nursing-student-assistance/can-someone-explain-138282.html http://allnurses.com/nursing-student-assistance/can-someone-explain-138282.html http://www.livingwithatrialfibrillation.com/pt-inr-test/ http://www.webmd.com/a-to-z-guides/prothrombin-time http://www.answers.com/Q/What_is_an_INR_blood_test http://www.cigna.com/healthwellness/hw/medical-tests/prothrombin-time-and-inr-hw203083 http://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=167&ContentID=international_normalized_ratio http://www.webmd.com/a-to-z-guides/prothrombin-time
what does inr measure?