Prothrombin Time normal range — check your value

Roughly 11 to 13.5 seconds, always read against the control value printed alongside it.

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Your Prothrombin Time test value

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Prothrombin Time

sec

What Prothrombin Time measures

How many seconds blood takes to clot through the extrinsic clotting pathway.

Prothrombin Time normal range chart

ResultProthrombin Time (sec)

Below rangeBelow 12.78

In range12.78 – 16.42

Above range16.42 and above

These bands are for female, 31–45 years. Enter your age and gender above to see the bands for you. The table below shows the range for every age and gender.

Prothrombin Time normal range by age and gender

AgeMaleFemale

0–1 years11 – 14 sec11 – 14 sec

2–6 years12.78 – 16.42 sec12.78 – 16.42 sec

7–11 years12.78 – 16.42 sec12.78 – 16.42 sec

12–17 years12.78 – 16.42 sec12.78 – 16.42 sec

18–30 years12.78 – 16.42 sec12.78 – 16.42 sec

31–45 years12.78 – 16.42 sec12.78 – 16.42 sec

46–60 years12.78 – 16.42 sec12.78 – 16.42 sec

60 years and above12.78 – 16.42 sec12.78 – 16.42 sec

What a high Prothrombin Time means, and common causes

Blood is taking longer than usual to clot through one of the two clotting pathways, so bleeding risk is higher.

Common causes: Warfarin and other blood thinners, liver disease, vitamin K deficiency, DIC, and inherited clotting factor deficiencies.

What a low Prothrombin Time means, and common causes

A short prothrombin time is seldom clinically significant.

Common causes: Occasionally seen with vitamin K supplements or a sample collection issue.

Frequently asked questions

Roughly 11 to 13.5 seconds, always read against the control value printed alongside it.

To confirm blood will clot normally once an incision is made, which is why it is a standard pre-operative test.

Yeh dekhne ke liye ki khoon theek se jamta hai ya nahin. Operation se pehle aur blood thinner lene walon mein zaroori hai.

Please note. This page explains what a number means against reference ranges for your age and gender. It does not diagnose anything, cannot see the rest of your report, and is no substitute for a doctor. If your lab’s printed range differs, your lab’s range applies.