Is Prothrombin time 37.9 high, normal or dangerous? What does PT level 37.9 mean?

📅 Medical Review Date: October 13, 2025

Your Prothrombin time level of 37.9 is a High Prothrombin time level.

A prothrombin time level of 37.9 seconds usually means blood takes longer than normal to clot. It suggests a bleeding disorder. High levels of prothrombin time can cause excessive bleeding, easy bruising, nosebleeds, bleeding gums, heavy periods, and blood in urine. This can be caused by liver disease, vitamin K deficiency, blood-thinning medications, or clotting factor deficiencies. Further tests are often needed to identify the cause and guide appropriate treatment.

High Prothrombin time levels may indicate underlying health problems. The normal range is typically between 12 seconds and 16 seconds. 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 Prothrombin time range for men is :12 - 16 seconds

Ideal values of Prothrombin time depending on age (male) :

Age	Ideal Prothrombin time value
<5 years	12.455
5-10 years	12.927
10-15 years	13.417
15-20 years	13.926
20-25 years	14.454
25-30 years	15.002
30-35 years	15.571
35-40 years	15.548
40-45 years	15.525
45-50 years	15.502
50-55 years	15.48
55-60 years	15.458
60-70 years	15.436
70-80 years	15.414
80-90 years	15.998
90-100 years	15.975
>100 years	15.952

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

Misdiagnosis is more common than people think—and the consequences can be serious. Delayed treatment, unnecessary medication, or worse. If you want a second opinion on your blood work, one option is to upload it to a site like wholebodyprotocol.com, where world-class doctors review your results. They charge a small fee—around $90 (though you'll want to check the latest price as it fluctuates)—and email you a detailed report. With over 12 million people affected by misdiagnosis every year, that little bit of extra peace of mind can go a long way.

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

Normal range of Prothrombin time found among women :12-16 seconds

Ideal values of Prothrombin time depending on age (female) :

Age	Ideal Prothrombin time value
<5 years	12.468
5-10 years	12.955
10-15 years	13.461
15-20 years	13.986
20-25 years	14.532
25-30 years	15.099
30-35 years	15.688
35-40 years	15.664
40-45 years	15.64
45-50 years	15.617
50-55 years	15.594
55-60 years	15.57
60-70 years	15.546
70-80 years	15.522
80-90 years	15.498
90-100 years	15.474
>100 years	15.45

If you take a Prothrombin time blood test and the results are not in the normal range (12-16 seconds), 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 Prothrombin time Test Is Done :

When your doctor orders a Prothrombin time test, it involves a straightforward blood draw to measure your Prothrombin time levels. A pathologist or lab technician will take a small sample of blood from a vein using a needle. Your Prothrombin time 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