Tf imapezeka kwambiri m'madzi a m'magazi, pafupifupi 1.20 ~ 3.25g/L. Mu anthu wathanzi ndowe, pali pafupifupi palibe. Pamene m`mimba thirakiti magazi, ndi Tf mu seramu otaya mu m`mimba thirakiti ndi excreted ndi ndowe, ndi wochuluka mu ndowe za m`mimba magazi odwala. Choncho, fecal Tf imagwira ntchito yofunikira komanso yofunikira kuti azindikire kutuluka kwa magazi m'mimba. Chidachi ndi mayeso osavuta, owoneka bwino omwe amazindikira Tf mu ndowe za anthu, amakhala ndi chidwi chodziwikiratu komanso kutsimikizika kwamphamvu. Mayeso otengera mfundo zapamwamba za ma antibodies a sandwich reaction ndi ukadaulo wa immunochromatographic assay analysis, amatha kupereka zotsatira mkati mwa mphindi 15.