What causes high INR and low FT3 thyroid?

High INR and low FT3 thyroid can be caused by many reasons.

If your INR is in between 0.9 ratio and 1.2 ratio and your FT3 thyroid is in between 2.3 pg/mL and 4.2 pg/mL then you need not worry as these are the normal ranges for INR and FT3 thyroid respectively. But if your levels are lesser or greater than the above values, then there may be some problem in your body.

Some examples of conditions that can 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)

Normal range of INR : 0.9 - 1.2 ratio

Ideal values of INR depending on age :

Age	Ideal INR value
<5 years	0.949
5-10 years	1.001
10-15 years	1.056
15-20 years	1.114
20-25 years	1.175
25-30 years	1.172
30-35 years	1.168
35-40 years	1.164
40-45 years	1.161
45-50 years	1.158
50-55 years	1.155
55-60 years	1.151
60-70 years	1.147
70-80 years	1.144
80-90 years	1.141
90-100 years	1.138
>100 years	1.2

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

Normal range of FT3 thyroid : 2.3 - 4.2 pg/mL

Ideal values of FT3 thyroid depending on age :

Age	Ideal FT3 thyroid value
<5 years	2.426
5-10 years	2.559
10-15 years	2.699
15-20 years	2.847
20-25 years	3.003
25-30 years	3.168
30-35 years	3.342
35-40 years	3.525
40-45 years	3.719
45-50 years	3.923
50-55 years	4.138
55-60 years	4.125
60-70 years	4.112
70-80 years	4.1
80-90 years	4.088
90-100 years	4.075
>100 years	4.063

High INR and low FT3 thyroid can be caused by a lot of reasons. If you take INR and FT3 thyroid blood tests and the results are higher than 1.2 ratio for INR and lower than 2.3 pg/mL for FT3 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 INR and FT3 thyroid Tests Are Done :

If your doctor wants INR and FT3 thyroid tests on you, you may need to go through these tests. During the INR and FT3 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 INR and FT3 thyroid Test reports by your pathologist.

Medical References

• MedlinePlus – Prothrombin Time Test and INR (PT/INR)
• Mayo Clinic – Prothrombin time test
• Cleveland Clinic – Prothrombin Time (PT/INR) Test