Coagulation tests measure your blood's capacity to clump, and how long it requires to clot. At the point when you have unexplained or delayed dying, strange outcomes on coagulation screening tests, for example, prothrombin time (PT) or fractional thromboplastin time (PTT), or have a relative with an innate coagulation factor lack; you might be tried when your medical care professional needs to screen the seriousness of a factor insufficiency or potentially the adequacy of therapy.