A partial thromboplastin time (PTT) test is a blood test that helps doctors assess your body’s ability to form blood clots. Bleeding triggers a series of reactions known as the coagulation cascade.

It’s often done along with another test, called the partial thromboplastin time (PTT) test, which looks at another set of factors. Together, they give your doctor a more complete picture of what ...

That’s when your doctor might order a partial thromboplastin time (PTT) test, which measures how many seconds it takes for your blood to clot. What Does a PTT Test Look For? Your body makes ...