Prostate-specific antigen (PSA) wani sunadari ne da sel a cikin prostate gland yake samar da shi, wanda karamin gland ne a cikin maza da ke kusa da mafitsara kuma yana samar da wani ruwa wanda ke cikin maniyyi. Kalmar “takamaiman” a cikin ƙayyadaddun antigen na prostate yana nufin gaskiyar cewa sel prostate ne ke samar da wannan furotin da farko kuma ba a samo shi a cikin wasu kyallen takarda ko gabobin jiki ba. Ana iya amfani da matakan PSA a cikin jini azaman kayan aikin tantance cutar kansar prostate, da kuma lura da ci gaban cutar da ingancin magani.