
Get answers to your child's growth, nutrition, and feeding behavior questions.
Growth and Nutrition Experts’s Bio | Q&A Archive
PT; Pro-time
The normal range is 11 to 13.5 seconds. The PT result will be longer in persons who take blood thinners.
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
When any of the blood clotting factors are lacking or not working properly, the PT is prolonged.
Increased PT may be due to:
Schafer AI. Approach to the patient with bleeding and thrombosis. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 178.