TF makamaka ilipo mu plasma, zokhudzana ndi 1.20 ~ 3.25g / l. M'magulu athanzi kumaso, palibe kukhalapo. Pakadutsa m'mimba magazi, TF mu seramu imayenda m'mimba ndikumatulidwa ndi ndowe, zimakhala zochulukirapo m'matanthwe amagazi. Chifukwa chake, Fecal Tf amatenga gawo lofunikira komanso lofunikira pakuzindikira magazi am'mimba. Chidacho ndi chiyeso chosavuta, chowoneka bwino chomwe chimazindikira TF m'maso mwa anthu, chimazindikira kwambiri komanso kunyalanyaza kwambiri. Kuyesedwa kotengera kuchuluka kwa ma antibodies awiri a sandwich ndipo njira ya golide immunoromatographictricttiographic, imatha kupereka zotsatira mkati mwa mphindi 15.