Lokheshi le-Fecal Occult Blood (FOB) yokuhlola amanqaku afakelwe ngamazibopheleli ezifundekwane zokuhlola amanqaku efikeleyo kufuneka abalimi bezokuhlelwa bethole amanqaku angaphandle kwezinto ezincediswayo ezifumanekayo ngendlela eyahlukileyo nokuthi. Lokho kusebenza kakhulu kwi-screening nokubheka izinto zomthwalisi we-gastrointestinal kunye ne-colorectal cancer. Ngoko ke, wonke amandla akho lokheshi akuyishayelekile nge-safety nokuthuthukisa ukuthi imithombo yezilungiselelo zikhululekile ngokuthi zikhuphwe ngendlela yokuhlola amanqaku aphandle kwesikhwama sokushicilela labasebenzi belokheshi.