The prothrombin time (PT) and its derived measures of prothrombin ratio (PR) and international normalized ratio (INR) are measures of the extrinsic pathway of coagulation. This test is also called `ProTime INR` and `PT/INR`. They are used to determine the clotting tendency of blood, in the measure of warfarin dosage, liver damage, and vitamin ...
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http://en.wikipedia.org/wiki/Prothrombin_time
(from the article `bleeding and blood clotting`) The activity of the extrinsic pathway may be assessed in the laboratory using a simple test known as the prothrombin time. Tissue extract, or tissue ... ...cells in the bone marrow that form platelets. A bleeding time greater than 20 minutes indicates an abnormality of platelet function. ...
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http://www.britannica.com/eb/a-z/p/123
Measurement of clotting time of plasma recalcified in the presence of excess tissue thromboplastin. Factors measured are fibrinogen, prothrombin, and factors v, vii, and x. It is used for monitoring anticoagulant therapy with coumarins. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
(Pro time) (PT) a test to measure the activity of factors I, II, V, VII, and X, which participate in the extrinsic pathway of coagulation. Deficiency of any of these factors leads to a prolongation of the one-stage prothrombin times, as will circulating anticoagulants that are active against factors V and ...
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http://www.encyclo.co.uk/local/21001
(PT) Type: Term Definitions: 1. the time required for clotting after thromboplastin and calcium are added in optimal amounts to blood of normal fibrinogen content; if prothrombin is diminished, the clotting time increases; used to evaluate the extrinsic clotting system.
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http://www.medilexicon.com/medicaldictionary.php?t=92121
Prothrombin time: A clotting test, the prothrombin time is done to test the integrity of part of the clotting scheme. The prothrombin time is commonly used as a method of monitoring the accuracy of blood thinning treatment (anticoagulation) with warfarin (Coumadin). Familiarly called the 'pro time,' the test is the time needed for clot formation af...
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http://www.medterms.com/script/main/art.asp?articlekey=8386
the time it takes for a sample of blood to clot after substances that speed clotting time have been added; used to measure the effect of anticoagulants
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https://www.encyclo.co.uk/local/20875
Measurement of clotting time of plasma in the presence of excess tissue thromboplastin. Factors measured are fibrinogen, prothrombin, and factors V, VII, and X.
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https://www.encyclo.co.uk/local/22445
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