Monitoring heparin therapy (unfractionated heparin [UFH]); Screening for certain coagulation factor deficiencies; Detection of coagulation inhibitors such as lupus anticoagulant, specific factor inhibitors, and nonspecific inhibitors.Activated Partial Thromboplastin Time (APTT) is also known as Kaolin Cephalin Clotting Time (KCCT); Partial Thromboplastin Time with Kaolin (PTTK) is a medical test that characterizes blood coagulation. Apart from detecting abnormalities in blood clotting, It is also used to monitor the treatment effects with heparin which is a major anticoagulant.