Is Prothrombin time 17.9 high, normal or dangerous? What does PT level 17.9 mean?

📅 Medical Review Date: June 9, 2026

Prothrombin time 17.9

Your Prothrombin time level of 17.9 is a High Prothrombin time level.

A prothrombin time level of 17.9 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.

Important - Scroll to the end of this article to see how our patients managed their high Prothrombin time levels 

⚠️ HIGH VALUE DETECTED

Your Prothrombin time is ⬆️ HIGH

Your level: 17.9 seconds (Normal range: 12–16 seconds)

17.9
Prothrombin time seconds
⬆️ Above Normal
Your Value 17.9 seconds
Normal Range 12–16 seconds
Severity Level MODERATE

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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 12.215
5-10 years 12.434
10-15 years 12.657
15-20 years 12.884
20-25 years 13.115
25-30 years 13.35
30-35 years 13.589
35-40 years 13.832
40-45 years 14.08
45-50 years 14.332
50-55 years 14.589
55-60 years 14.85
60-70 years 15.116
70-80 years 15.387
80-90 years 15.662
90-100 years 15.942
>100 years 15.937

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

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Important - Read more questions about high Prothrombin time levels after this video message 

A video message on the treatment of your high Prothrombin time level

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Important - At the end of this article read how our patients treated their high Prothrombin time levels 

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

Important - At the end of this article read how our patients treated their high Prothrombin time levels 

📖 Everything You Need to Know About Prothrombin time 17.9 seconds



What does High Prothrombin time 17.9 seconds mean?

High Prothrombin time 17.9 seconds means that the prothrombin time value in the blood is above the normal reference range.

This value can indicate that it takes longer than usual for the blood to clot. Prothrombin time plays an important role in evaluating how well the blood can form clots to stop bleeding.

An elevated value can occur temporarily, for example due to certain medications, changes in diet, or mild liver stress. In some cases, however, it can also be associated with certain health changes or underlying conditions. The value is considered an important indicator of the blood's clotting function and overall health.

This result can point to changes in the body, which is why further examinations or checks may be recommended if necessary. An early assessment can help to better monitor the health status.

Understanding what a high value means requires looking at the full clinical picture, including other test results, medical history, and any symptoms. Only a healthcare professional can provide an accurate interpretation based on your individual situation.

Is High Prothrombin time 17.9 seconds dangerous?

High Prothrombin time 17.9 seconds can be considered concerning in certain cases, depending on how high the value is and the underlying reason for the elevation.

A mild elevation often causes no immediate complaints and may be a temporary response to factors like medication use or dietary changes. However, if the value rises significantly, the blood may take much longer to clot, which may increase the risk of bleeding or difficulty stopping bleeding after an injury.

If the value remains elevated over a longer period of time, factors such as liver disease, vitamin K deficiency, or ongoing use of anticoagulant medications may play a role. Such persistent changes should not be left unaddressed and warrant medical evaluation.

Since a persistently elevated value can indicate health abnormalities, medical clarification is recommended. Regular check-ups are important, even if no symptoms are present, to monitor trends over time and catch potential issues early.

The level of risk depends on multiple factors including your age, overall health, lifestyle, and the specific cause of the elevation. What may be harmless for one person could be significant for another, which is why professional medical interpretation is essential.

How can one lower High Prothrombin time 17.9 seconds?

To lower High Prothrombin time 17.9 seconds, it is important to take the underlying cause into account rather than simply trying to shorten the clotting time without understanding why it is elevated.

  • Ensuring consistent and adequate vitamin K intake through diet when recommended by a doctor
  • Treatment of existing conditions such as liver disease or malabsorption issues
  • Adjustment or review of medications, especially blood thinners, under medical supervision
  • Balanced lifestyle including a healthy diet and avoiding excessive alcohol
  • Regular medical check-ups to monitor changes over time
  • Adequate rest and stress management for overall well-being

In particular, following medical advice on diet and addressing temporary factors like medication effects can help to positively influence the value when temporary factors are involved. Addressing the root cause is always more effective than focusing on the number alone.

Depending on the cause, additional medical measures such as vitamin K supplementation or changes in anticoagulant therapy may be necessary. These treatments should only be undertaken under proper medical supervision. Medical advice is therefore important before making any significant changes.

Lifestyle adjustments can take several weeks to show effects on blood values. Consistency and patience are key, along with follow-up testing to ensure the approach is working appropriately for your situation.

Treatment of High Prothrombin time 17.9 seconds

The treatment of High Prothrombin time 17.9 seconds depends entirely on the underlying cause and the extent of the elevation, as well as your individual health status and risk factors.

  • Treatment of underlying conditions such as liver disease or vitamin deficiencies
  • Adjustment of medications, particularly anticoagulants, with close monitoring
  • Supplementation with vitamin K if deficient and prescribed by a healthcare provider
  • Regular blood tests to monitor trends and response to treatment
  • In certain cases, special medical therapies such as administration of clotting factors or plasma products
  • Collaboration with specialists like hematologists or hepatologists when needed

The appropriate treatment depends on the individual situation and should be assessed medically by a healthcare professional. Self-treatment without proper diagnosis can be ineffective or even harmful.

Through suitable measures, the value can be stabilized and general well-being supported. Many people see improvement within weeks to months when the underlying cause is properly addressed.

Continuous follow-up remains important in this process to adjust treatment as needed and ensure long-term health outcomes. Your doctor can help create a personalized plan that fits your specific needs and circumstances.

Frequently Asked Questions

What causes high Prothrombin time 17.9 seconds?

High Prothrombin time 17.9 seconds can be caused by anticoagulant medications such as warfarin, vitamin K deficiency, liver diseases, certain antibiotics or other medications, or inherited disorders affecting clotting factors. A doctor can help identify the specific cause based on your full health picture and additional testing.

Should I be worried if my Prothrombin time is high like 17.9 seconds?

Not necessarily. In some situations, such as when taking blood-thinning medication, a higher prothrombin time may be the intended therapeutic effect. However, unexpectedly high values or values that are too high can increase bleeding risk and should be evaluated by a healthcare professional. Your doctor will consider the full context of your health before making any conclusions.

Can diet and lifestyle changes lower high Prothrombin time levels?

Yes, in many cases when the elevation is related to diet or temporary factors. Maintaining a consistent intake of vitamin K-rich foods, avoiding sudden dietary changes if on certain medications, limiting alcohol, and managing underlying conditions can help normalize levels. Always consult your healthcare provider before making significant lifestyle or diet changes, especially if you are taking medications that affect blood clotting.

Summary

High Prothrombin time 17.9 seconds indicates that the value is above the normal range and may be associated with changes in clotting factor activity, medication effects, nutrition, or liver function.

Temporary causes such as dietary variations or medication adjustments are possible, but persistently elevated values should be medically clarified to rule out serious underlying conditions.

Early assessment and appropriate measures are important for maintaining good health. Through proper examinations and suitable care, health can be supported and maintained over time.

Understanding one's own blood values helps to make informed decisions for personal well-being and encourages productive conversations with healthcare providers about your health concerns.

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

Ideal values of Prothrombin time depending on age (female) :
AgeIdeal Prothrombin time value
<5 years 12.221
5-10 years 12.446
10-15 years 12.675
15-20 years 12.909
20-25 years 13.147
25-30 years 13.389
30-35 years 13.636
35-40 years 13.887
40-45 years 14.143
45-50 years 14.404
50-55 years 14.67
55-60 years 14.94
60-70 years 15.215
70-80 years 15.496
80-90 years 15.782
90-100 years 15.777
>100 years 15.772

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

Symptoms
Dr. Hernandez - Pathologist

Medically Reviewed By

Dr. Hernandez, MD

BOARD CERTIFIED PATHOLOGIST

Laboratory Medicine Specialist

View Full Profile & Credentials →

Laboratory Expertise:

  • Clinical Pathology Certification
  • 15+ years lab analysis experience
  • Specializes in test interpretation
  • Medical Advisory Board Member

Medical Disclaimer: This information is for educational purposes and should not replace professional medical advice. Consult your physician for diagnosis and treatment. Read full disclaimer.

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