Is INR 4.2 high, normal or dangerous? What does INR level 4.2 mean?

📅 Medical Review Date: October 17, 2025

Your INR level of 4.2 is a High INR level.

High INR levels may indicate underlying health problems. The normal range is typically between 0.9 ratio and 1.2 ratio. If your levels are outside this range, it's important to speak with a healthcare provider. Consulting a doctor is recommended to determine the cause and appropriate next steps.

The normal INR range for men is :0.9 - 1.2 ratio

Ideal values of INR depending on age (male) :

Age	Ideal INR value
<5 years	0.938
5-10 years	0.977
10-15 years	1.018
15-20 years	1.061
20-25 years	1.106
25-30 years	1.152
30-35 years	1.2
35-40 years	1.198
40-45 years	1.196
45-50 years	1.194
50-55 years	1.192
55-60 years	1.19
60-70 years	1.188
70-80 years	1.186
80-90 years	1.184
90-100 years	1.182
>100 years	1.18

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

Get Advice via Email : Send us your blood test report, and our INR experts will review it. You'll receive a detailed analysis and personalized treatment guidance via email within 12 hours. If you have additional blood test results besides INR, please include those too—an accurate diagnosis often requires a full view of all abnormalities. Upload blood test report now

1,51,150

Total number of patients treated

A video message on the treatment of your high INR level

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

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)

Receive world-class medical opinion about your high INR levels over email.Upload blood test report now

Normal range of INR found among women :0.9-1.2 ratio

Ideal values of INR depending on age (female) :

Age	Ideal INR value
<5 years	0.939
5-10 years	0.98
10-15 years	1.022
15-20 years	1.066
20-25 years	1.112
25-30 years	1.16
30-35 years	1.158
35-40 years	1.156
40-45 years	1.154
45-50 years	1.152
50-55 years	1.15
55-60 years	1.2
60-70 years	1.198
70-80 years	1.196
80-90 years	1.194
90-100 years	1.192
>100 years	1.19

If you take a INR blood test and the results are not in the normal range (0.9-1.2 ratio), your physician may recommend more tests to figure out the problem. You might also get this test if your physician thinks you have some other disease.

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How the INR Test Is Done :

When your doctor orders a INR test, it involves a straightforward blood draw to measure your INR levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your INR test results are usually available within a few hours.

Medical References

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