METREYRIZ (Metreurysis; yun. metra – bachadon va euryno – vase kardan), yake az usulhoi jarrohii akusheri. Dar mavridi M. ba javfi bachadoni bordor balloni rezini (metreyrinter) vorid sokhta, onro bo mahluli izotonii khloridi natriy pur mekunand. Ba bachadon vorid sokhtani metreyrinter ba boz gashtani gardanai bachadon musoidat namuda, faoliyati zodanro metezonad, hangomi kuchidani hamrohaki dar pesh joygirifta onro ba devorai bachadon zer va khunraviro kam mekunad. Solhoi pesh M. bisyor istifoda meshud. Felan onro binobar dar amal tatbiq shudani dig. usulhoi bosamari jarrohi khele kam kor mefarmoyand.