5 rads) & anaesthetic gases Endocrine problems like : - Luteal phase defect (deficiency of progesterone) -- Thyroid abnormalities - hypothyroidism. - Poorly controlled diabetes mellitus -- PCOD Immunological causes : -- Antiphospholipid antibody syndrome -- Inherited thrombophilias Uterine factors like -- Cervical incompetence -- Mullerian anomalies - Large and multiple submucous leiomyoma -- Ashermann syndrome -- DES exposure in utero Others : Trauma; Subchorionic hematoma; Defective placentation Mnemonic to remember maternal causes of aboion--Mnemonic T = Trauma 12 = Infections/immunological causes M = Maternal medical diseases E' = Environmental factors/Endocrine problem D = Developmental/anatomical problems Mnemonic to remember maternal causes of aboion--Mnemonic T = Trauma 12 = Infections/immunological causes M = Maternal medical diseases E' = Environmental factors/Endocrine problem D = Developmental/anatomical problems">