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Results. Prothrombin time test results can be presented in two ways. In seconds. The average time range for blood to clot is about 10 to 13 seconds. A number higher than that range means it takes blood longer than usual to clot. A number lower than that range means blood clots more quickly than normal. As INR. This ratio — which allows for ...
An international normalized ratio (INR) is a blood test that indicates how well the blood is able to clot. People who take warfarin (Coumadin) need to monitor this level to make sure it doesn’t go too high or too low. A normal INR range is 0.8 to 1.1 if you’re not taking anticoagulant medications.
The normal ranges for PT/INR results are: 11 to 13.5 seconds. INR of 0.8 to 1.1. INR of 2.0 to 3.0 if you’re taking warfarin. (There are some conditions for which a higher or lower target PT range is desired.) Abnormal PT results. A high PT test result or INR level means it takes more time than usual for your blood to clot.
What does a low INR in a blood test mean? A low level of INR (International Normalized Ratio) shows a decrease in the time necessary to complete the clotting process. When there is a hemorrhage, the clotting process is activated to stop the bleeding.
Low INR values mean that you may be at risk of dangerous blood clots. High INR values mean that you may be at risk of dangerous bleeding. Based on the values, a healthcare provider can decide if the warfarin dose needs to be adjusted or if other interventions are needed.
If your INR is too low, you could be at risk for a blood clot. If it’s too high, you could experience bleeding. A typical INR target ranges from 2-3 but can vary from person to person.
A prothrombin time test tells you how long it takes your blood to clot. Learn what it looks for, when you might need one, and what the results mean.
A PT/INR test is most often used to: See how well warfarin, an anti-coagulant or blood-thinning medicine, is working to prevent blood clots. (Coumadin is a common brand name for warfarin.) Your provider may change your dose based on these results. Find out the reason for abnormal blood clots.
If your INR is too low, you could be at risk for a blood clot – but if it’s too high, you could experience bleeding. A typical INR target ranges from 2-3 but can vary from patient to patient. Patients with a tendency towards clotting may have a range targeting 3-4, whereas patients with a higher bleeding risk may have a lower INR between 2-2.5.
A longer-than-normal PT can mean a lack of or low level of one or more blood clotting factors (factors I, II, V, VII, or X). It can also mean a lack of vitamin K; liver disease, such as cirrhosis ; or that a liver injury has occurred.