What does a high PTT mean?
Abnormal values A longer-than-normal PTT or APTT can mean a lack of or low level of one of the blood clotting factors or another substance needed to clot blood. This can be caused by bleeding disorders, such as hemophilia or von Willebrand’s disease.
What is a normal PTT time?
The reference range of the PTT is 60-70 seconds. In patients receiving anticoagulant therapy, the reference range is 1.5-2.5 times the control value in seconds. Critical values that should prompt a clinical alert are as follows: aPTT: More than 70 seconds (signifies spontaneous bleeding)
What happens if aPTT is high?
A prolonged aPTT usually means that clotting is taking longer to occur than expected (but is associated with increased risk of blood clots if due to a lupus anticoagulant) and may be caused by a variety of factors (see the list below).
Why is high PTT bad?
This could cause heart attacks, strokes, or other problems. Too much can cause heavy bleeding. Have unexplained blood clots: Your doctor may order the PTT test to help diagnose a specific immune system disorder that can cause clots. In pregnant women, the disorder can lead to miscarriages and other problems.
What do the results of a PTT test mean?
Your PTT test results will show how much time it took for your blood to clot. Results are usually given as a number of seconds. If your results show that your blood took a longer-than-normal time to clot, it may mean you have: A bleeding disorder, such as hemophilia or von Willebrand disease.
How does partial thromboplastin time ( PTT ) work?
URL of this page: //medlineplus.gov/ency/article/003653.htm. Partial thromboplastin time (PTT) is a blood test that looks at how long it takes for blood to clot. It can help tell if you have a bleeding problem or if your blood does not clot properly.
How long does it take for a PTT to clot?
A PTT test is usually done with other tests, such as the prothrombin test. In general, clotting should occur within 25 to 35 seconds. If the person is taking blood thinners, clotting takes up to 2 ½ times longer. Normal value ranges may vary slightly among different labs. Some labs use different measurements or may test different specimens.
Do you need to fast for a PTT test?
You won’t need to fast, but don’t eat a high-fat meal beforehand. It can affect the results. Tell your doctor about all the medications and supplements you take. Aspirin, blood thinners, antihistamines, and some other medicines can interfere with the results. A PTT test involves a simple blood draw that takes just a few minutes.