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Doctor insights on: What Is A Critical Value For Prothrombin Time

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Dr. Shimae Fitzgibbons
209 doctors shared insights

Prothrombin Time (Definition)

Prothrombin time provides information regarding the extrinsic pathway involved in clot formation. It's commonly used ...Read more


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What does a prothrombin time measurement do?

Extrinsic pathway of: Clotting. Pt is dependent on levels of multiple coagulation factors, including x, ix vii, v, and ii. ...Read more

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Decrease in prothrombin time can lead to what?

Decrease in prothrombin time can lead to what?

Repeat test.: A shortened clotting time that does not appear to reflect technical error has been associated with an increased risk of thrombosis, recurrent thrombosis, recurrent miscarriage, or bleeding, and may increase the risk of thrombosis associated with other common thrombotic risk factors (eg, factor v leiden, obesity, increased levels of d-dimer). ...Read more

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How can I get a normal range of prothrombin time?

How can I get  a normal range of prothrombin time?

12 Seconds, but INR: Normal prothrombin time varies a from lab to lab; the average value is about 12 seconds. To compensate for the variability, the ratio of each lab's normal to the patient value is reported as international normalized ratio (inr) and an inr of 1.0 is normal. ...Read more

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What does an abnormal prothrombin time test mean for you?

What does an abnormal prothrombin time test mean for you?

Abnormal clotting : An abnormal prothrombin time means that there is something wrong with your blood's ability to form clots and prevent bleeding. There are many conditions that result in such an abnormality, and you need to have your doctor figure out what the problem is based on other test findings and your symptoms. Sometimes you'll need a hematologist to consult if there is a chance of a serious bleeding problem. ...Read more

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What is the definition or description of: prothrombin time?

What is the definition or description of: prothrombin time?

PTT: Prothrombin time provides information regarding the extrinsic pathway involved in clot formation. It's commonly used to monitor warfarin therapy. ...Read more

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My baby was tested for prothrombin time. His value is 16. Ok?

My baby was tested for prothrombin time. His value is 16. Ok?

Depends: Pt of 16 is higher than the normal in most laboratories. However, the value needs to be taken in the context of other issues. Was the baby pre-mature? Is there any abnormal bleeding? Was the baby given vitamin k and pt repeated? It would be prudent to consult your pediatrician. ...Read more

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When would a baby of 1-2 months need prothrombin time testing? What are they looking for?

When would a baby of 1-2 months need prothrombin time testing? What are they looking for?

Unexplaind bruises: When a doctor orders prothrombin time and other clotting tests, he/she is probably looking for a bleeding disorder that may explain bruises in a baby that young. ...Read more

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High prothrombin time levels affect bleeding?

High prothrombin time levels affect bleeding?

Yes.: Prothrombin times about three times higher than normal for the particular lab may be a risk for abnormal bleeding. ...Read more

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What is thrombocytopenia and how is a prothrombin time test used?

What is thrombocytopenia and how is a prothrombin time test used?

Blood clotting: Thrombocytopenia means low level of blood plateletes. Prothrombin time is a test for extrinsic coagulation pathway that is initiated with factor vii. Vitamin k deficiency or use of Coumadin (warfarin) or liver function deficiency will prolong the prothrombin time, while several blood clotting diseases that affect intrinsic coagulation such as von willibrand or hemophila will not affect prothrombin time. ...Read more