Partial Thromboplastin Time (PTT), Activated The PTT test is ordered when someone has unexplained bleeding or clotting. The PTT is often used as a starting place when investigating the cause of a bleeding. This is non-fasting blood test that results in 2-3 business days. Please be advised that our services are strictly self-pay and not eligible for submission as a claim to your health insurance provider, medical bill sharing company, Medicare/Medicaid or other third-party payor. 763