Prothrombin Time Test: About Your Child's Test
What is a prothrombin time test?
Prothrombin time (PT) is a blood test. It measures how long it takes for blood to clot. Prothrombin is one of several clotting factors that the body makes. It helps your child's blood form clots when a blood vessel is damaged.
A PT test may also be called an INR (international normalized ratio) test.
Why is this test done?
The test can be used to check for bleeding problems. It is also used to check how well warfarin, a medicine to prevent blood clots, is working.
How do you prepare for the test?
In general, there's nothing you have to do before your child has this test, unless your doctor tells you to.
How is the test done?
A health professional uses a needle to take a blood sample, usually from the arm.
How long does the test take?
The test will take a few minutes.
What happens after the test?
Your child will likely be able to go home right away. And your child can go back to their usual activities right away.
Follow-up care is a key part of your child's treatment and safety. Be sure to make and go to all appointments, and call your doctor or nurse advice line (811 in most provinces and territories) if your child is having problems. Ask your doctor when you can expect to have your child's test results.
Where can you learn more?
Go to https://www.healthwise.net/patientEd
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Current as of: September 7, 2022
Author: Healthwise Staff
Medical Review:Kathleen Romito MD - Family Medicine & Martin J. Gabica MD - Family Medicine & Adam Husney MD - Family Medicine & E. Gregory Thompson MD - Internal Medicine & John Pope MD - Pediatrics & Donald Sproule MDCM, CCFP - Family Medicine
