APTT ita ce taƙaitaccen lokacin prothrombin da aka kunna a Turanci. APTT gwajin tantancewa ne wanda ke nuna hanyar coagulation ta ciki. Tsawon APTT yana nuna cewa wani abu na coagulation na jini da ke da hannu a cikin hanyar coagulation ta ciki ta ɗan adam ba shi da aiki. Bayan an tsawaita APTT, majiyyaci zai sami alamun zubar jini bayyananne. Misali, marasa lafiya da ke fama da hemophilia A, hemophilia B, da cutar von Willebrand duk za su sami dogon APTT, kuma majiyyaci zai sami ecchymosis a fata da membranes na mucous, da zubar jini a tsoka, zubar jini a gaɓɓai, hematoma, da sauransu. Musamman ga marasa lafiya da ke fama da hemophilia A, nakasar gaɓɓai da atrophy na tsoka galibi ana barin su bayan an sha hematoma saboda synovitis da zubar jini a gaɓɓai ke haifarwa, wanda ke da mummunan tasiri ga lafiya. Bugu da ƙari, coagulation na cikin jijiyoyin jini da aka yaɗu, cututtukan hanta mai tsanani da sauran cututtuka suma za su haifar da tsawaita APTT sosai, wanda zai haifar da lahani ga jikin ɗan adam.
Babban darajar Aptt yana nuna cewa majiyyaci na iya fama da matsalolin zubar jini. Matsalolin zubar jini da aka saba gani sun haɗa da ƙarancin abubuwan da ke haifar da coagulation da kuma hemophilia. Na biyu, ana zargin cutar hanta ce ke haifar da shi ko kuma cutar jaundice ko thrombosis. Haka kuma ba a kawar da cewa tasirin abubuwan da ke haifar da shi ba ne, kamar amfani da magungunan hana zubar jini na dogon lokaci. A asibiti, ana iya amfani da gwajin aptt don tantance ko aikin coagulation a jikin majiyyaci al'ada ne. Idan ya faru ne saboda abin da ke haifar da hemophilia, ana ba da shawarar a bi shawarar likita don dakatar da zubar jini ko amfani da maganin prothrombin complex.