Disclosed are means of preventing, reducing and/or treating pregnancy associated complications by administration of Noble Gas mixtures, directly by inhalation, or by other means of direct or indirect introduction, with the intended effect of reducing immunological/inflammatory events associated with said complications. In one embodiment the invention teaches the modulation of the maternal-fetal unit from a Th1/Th17 predisposition towards a Th2/Treg environment by inhalation of a combination of 30% xenon gas admixed with air, or combinations of medical grade oxygen and nitrogen.
