Is Prothrombin time 18.7 high, normal or dangerous? What does PT level 18.7 mean?

📅 Medical Review Date: October 18, 2025

Your Prothrombin time level of 18.7 is a High Prothrombin time level.

A prothrombin time level of 18.7 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	12.224
5-10 years	12.453
10-15 years	12.686
15-20 years	12.923
20-25 years	13.165
25-30 years	13.411
30-35 years	13.662
35-40 years	13.917
40-45 years	14.177
45-50 years	14.442
50-55 years	14.712
55-60 years	14.987
60-70 years	15.267
70-80 years	15.552
80-90 years	15.843
90-100 years	15.837
>100 years	15.831

*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	12.231
5-10 years	12.467
10-15 years	12.707
15-20 years	12.952
20-25 years	13.201
25-30 years	13.455
30-35 years	13.714
35-40 years	13.978
40-45 years	14.247
45-50 years	14.521
50-55 years	14.801
55-60 years	15.086
60-70 years	15.377
70-80 years	15.673
80-90 years	15.975
90-100 years	15.969
>100 years	15.963

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