When Is Ptt Drawn?

The PTT may be ordered along with other tests such as a PT when you have: Unexplained bleeding or easy bruising. A blood clot in a vein or artery. An acute condition such as disseminated intravascular coagulation (DIC) that may cause both bleeding and clotting as coagulation factors are used up at a rapid rate.

When should the blood test for an aPTT be taken?

You may need this test if your healthcare provider believes that you have a problem with 1 or more clotting factors. If you have a bleeding disorder such as von Willebrand disease or another disease that prevents your blood from clotting, this test can help find out where the problem is.

How often is PTT drawn?

For patients on continuous unfractionated heparin, infusion blood is drawn every 6 hours to facilitate dosing adjustments.