What causes high INR and low Prothrombin time?

High INR and low Prothrombin time can be caused by many reasons.

If your INR is in between 0.9 ratio and 1.2 ratio and your Prothrombin time is in between 12 seconds and 16 seconds then you need not worry as these are the normal ranges for INR and Prothrombin time respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Normal range of INR : 0.9 - 1.2 ratio

Ideal values of INR depending on age :

Age	Ideal INR value
<5 years	0.951
5-10 years	1.005
10-15 years	1.062
15-20 years	1.122
20-25 years	1.186
25-30 years	1.182
30-35 years	1.178
35-40 years	1.174
40-45 years	1.171
45-50 years	1.168
50-55 years	1.164
55-60 years	1.16
60-70 years	1.156
70-80 years	1.153
80-90 years	1.149
90-100 years	1.145
>100 years	1.141

*Ideal values are calculated based on our database of patient records

If you want your blood test report to be interpreted by INR specialist, then you can upload your report. Our INR expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

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Some examples of conditions that increase or decrease INR levels include:

• Liver disease
• Vitamin K abnormality
• Decreased or defective factor I (fibrinogen), II (prothrombin), V or X
• Hemophilia A and hemophilia B
• Autoantibody against a specific factor (e.g., factor VIII)

If you want your blood test report to be interpreted by INR specialist, you can upload your report. Our INR expert will provide you with the most accurate interpretation of your blood test results and treatment within 12 hours. Upload blood test report now

Normal range of Prothrombin time : 12 - 16 seconds

Ideal values of Prothrombin time depending on age :

Age	Ideal Prothrombin time value
<5 years	12.682
5-10 years	13.402
10-15 years	14.163
15-20 years	14.967
20-25 years	15.817
25-30 years	15.766
30-35 years	15.716
35-40 years	15.666
40-45 years	15.616
45-50 years	15.566
50-55 years	15.516
55-60 years	15.466
60-70 years	15.416
70-80 years	15.367
80-90 years	15.318
90-100 years	15.269
>100 years	15.219

High INR and low Prothrombin time can be caused by a lot of reasons. If you take INR and Prothrombin time blood tests and the results are higher than 1.2 ratio for INR and lower than 12 seconds for Prothrombin time, your physician may recommend more tests to figure out the problem. You might also get these tests if your physician thinks you have some other disease.

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How the INR and Prothrombin time Tests Are Done :

If your doctor wants INR and Prothrombin time tests on you, you may need to go through these tests. During the INR and Prothrombin time blood tests, a pathologist will put a needle into your veins and take out a small quantity of blood. A pathologist is a physician in the medical field who thoroughly studies the causes and effects of disease. Within a few hours you will get your INR and Prothrombin time Test reports by your pathologist.