What causes high APTT and low INR?

High APTT and low INR can be caused by many reasons.

If your APTT is in between 22 seconds and 35 seconds and your INR is in between 0.9 ratio and 1.2 ratio then you need not worry as these are the normal ranges for APTT and INR 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 APTT : 22 - 35 seconds

Ideal values of APTT depending on age :

Age	Ideal APTT value
<5 years	22.39
5-10 years	22.787
10-15 years	23.191
15-20 years	23.602
20-25 years	24.021
25-30 years	24.447
30-35 years	24.881
35-40 years	25.322
40-45 years	25.771
45-50 years	26.228
50-55 years	26.693
55-60 years	27.167
60-70 years	27.649
70-80 years	28.139
80-90 years	28.638
90-100 years	29.146
>100 years	29.663

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

If you want your blood test report to be interpreted by APTT specialist, then you can upload your report. Our APTT 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 APTT levels include:

• Liver disease
• Vitamin K abnormality
• Decreased or defective factor I (fibrinogen), II (prothrombin), V or X
• Hemophilia A and hemophilia B
• Willebrand disease

If you want your blood test report to be interpreted by APTT specialist, you can upload your report. Our APTT 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 INR : 0.9 - 1.2 ratio

Ideal values of INR depending on age :

Age	Ideal INR value
<5 years	0.916
5-10 years	0.932
10-15 years	0.949
15-20 years	0.966
20-25 years	0.983
25-30 years	1
30-35 years	1.018
35-40 years	1.036
40-45 years	1.054
45-50 years	1.073
50-55 years	1.092
55-60 years	1.111
60-70 years	1.131
70-80 years	1.151
80-90 years	1.171
90-100 years	1.192
>100 years	1.191

High APTT and low INR can be caused by a lot of reasons. If you take APTT and INR blood tests and the results are higher than 35 seconds for APTT and lower than 0.9 ratio for INR, 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 APTT and INR Tests Are Done :

If your doctor wants APTT and INR tests on you, you may need to go through these tests. During the APTT and INR 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 APTT and INR Test reports by your pathologist.