Mafuta owuma ndi zida zamankhwala zomwe zimayesa zomwe mpweya umakhala m'magazi omwalila wodwala. Oximers oximers amapereka njira yosatha yoyezera magazi okwera magazi kapena opanga hemoglobin. Mafuta oximeter amathanso kudziwa zotupa zam'madzi, momwemonso kuwerengetsa ndikuwonetsa kuchuluka kwa wodwala.