What causes high Prothrombin time and low FT4 thyroid?

High Prothrombin time and low FT4 thyroid can be caused by many reasons.

If your Prothrombin time is in between 12 seconds and 16 seconds and your FT4 thyroid is in between 0.89 ng/dL and 1.76 ng/dL then you need not worry as these are the normal ranges for Prothrombin time and FT4 thyroid 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 Prothrombin time : 12 - 16 seconds

Ideal values of Prothrombin time depending on age :

Age	Ideal Prothrombin time value
<5 years	12.126
5-10 years	12.253
10-15 years	12.382
15-20 years	12.512
20-25 years	12.643
25-30 years	12.776
30-35 years	12.91
35-40 years	13.046
40-45 years	13.183
45-50 years	13.321
50-55 years	13.461
55-60 years	13.602
60-70 years	13.745
70-80 years	13.889
80-90 years	14.035
90-100 years	14.182
>100 years	14.331

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

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

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

If you want your blood test report to be interpreted by Prothrombin time specialist, you can upload your report. Our Prothrombin time 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 FT4 thyroid : 0.89 - 1.76 ng/dL

Ideal values of FT4 thyroid depending on age :

Age	Ideal FT4 thyroid value
<5 years	0.89935
5-10 years	0.90879
10-15 years	0.91833
15-20 years	0.92797
20-25 years	0.93771
25-30 years	0.94756
30-35 years	0.95751
35-40 years	0.96756
40-45 years	0.97772
45-50 years	0.98799
50-55 years	0.99836
55-60 years	1.00884
60-70 years	1.01943
70-80 years	1.03013
80-90 years	1.04095
90-100 years	1.05188
>100 years	1.06292

High Prothrombin time and low FT4 thyroid can be caused by a lot of reasons. If you take Prothrombin time and FT4 thyroid blood tests and the results are higher than 16 seconds for Prothrombin time and lower than 0.89 ng/dL for FT4 thyroid, 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 Prothrombin time and FT4 thyroid Tests Are Done :

If your doctor wants Prothrombin time and FT4 thyroid tests on you, you may need to go through these tests. During the Prothrombin time and FT4 thyroid 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 Prothrombin time and FT4 thyroid Test reports by your pathologist.