High prothrombin time is caused by blood-thinning drugs such as warfarin, a lack or limited level of blood clotting factors and inhibitor substances. Alteration in the activity of one or more clotting factors and increas... More »

High prothrombin time levels mean a patient's blood clotting time is longer than normal, states Mayo Clinic. Average prothrombin times range between 10 and 14 seconds. Results for patients taking warfarin, a blood thinne... More »

The normal international normalization ratio range for people who are not on blood-thinning medicines is 0.8 to 1.1, according to MedlinePlus. However, an INR of 2.0 and 3.0 is effective for patients who need full antico... More »

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For patients who are taking blood-thinning drugs, such as warfarin, the normal level of PT/INR or prothrombin time expressed in international normalized ratio ranges from 2.0 to 3.0, states Mayo Clinic. This value is ind... More »

A lack of coordination or clumsiness that cause individuals to constantly drop or spill things can be attributed to a variety of factors that include vision problems, tiredness, arthritis and head injuries, according to ... More »

For calculating the international normalized ratio, a patient's prothrombin time is divided by the mean normal prothrombin time. This ratio is raised to a power called the international sensitivity index. More »

The measurement of prothrombin time and INR levels indicate whether a patient is responding appropriately to warfarin, a blood-thinning medication, according to Lab Tests Online. Warfarin requires careful monitoring to p... More »