Cytophotometry fasaha ce ta kimiyya wacce ta kunshi auna yawan hasken da kwayoyin halitta ke sha ko wasu kwayoyin halitta. Ana amfani da wannan dabara galibi don nazarin sinadarai da kaddarorin jiki na sel, kamar girmansu, siffarsu, da abun da ke ciki. Hakanan ana iya amfani da cytophotometry don ƙididdige adadin DNA, RNA, ko furotin a cikin tantanin halitta, wanda zai iya ba da mahimman bayanai game da aikin salula da aiki. Kalmar "cytophotometry" ta samo asali ne daga kalmomin Helenanci "cyto" (cell), "photo" (haske), da "metron" (ma'auni).