Prothrombin Time Test and INR (PT/INR) 10 to 13 seconds INR (international normalized ratio) 1.1 or below The therapeutic range for most patients on VKAs(Vit K antagonists ) is an INR of 2.0 to 3.0. 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. The normal range for PT is 10 to 13 seconds. The normal INR for a healthy individual is 1.1 or below, and the therapeutic range for most patients on VKAs( Vit K antagonists) is an INR of 2.0 to 3.0. An increased PT/INR for patients on VKAs (vitamin K-antagonists ) may suggest a super-therapeutic level and will require medication dose adjustments to prevent bleeding. In healthy people, an INR of 1.1 or below is considered normal. An INR range of 2.0 to 3.0 is generally an effective therapeutic r
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