Is Prothrombin time 18.5 high, normal or dangerous? What does PT level 18.5 mean?

📅 Medical Review Date: December 19, 2025

Your Prothrombin time level of 18.5 is a High Prothrombin time level.

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	12.222
5-10 years	12.448
10-15 years	12.678
15-20 years	12.913
20-25 years	13.152
25-30 years	13.395
30-35 years	13.643
35-40 years	13.895
40-45 years	14.152
45-50 years	14.414
50-55 years	14.681
55-60 years	14.953
60-70 years	15.23
70-80 years	15.512
80-90 years	15.799
90-100 years	15.793
>100 years	15.787

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

Get Advice via Email : Send us your blood test report, and our Prothrombin time 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 Prothrombin time, please include those too—an accurate diagnosis often requires a full view of all abnormalities. 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

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

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	12.229
5-10 years	12.462
10-15 years	12.699
15-20 years	12.941
20-25 years	13.188
25-30 years	13.439
30-35 years	13.695
35-40 years	13.956
40-45 years	14.222
45-50 years	14.493
50-55 years	14.769
55-60 years	15.05
60-70 years	15.337
70-80 years	15.629
80-90 years	15.927
90-100 years	15.921
>100 years	15.915

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