AMH and endometriosis: Published data show a significant reduction in AMH values in the presence of endometriomas compared to the absence of endometriosis.7Surgical excision of endometriomas appears to negatively influence ovarian reserve, but only temporarily.22, 23Other data suggest that the mere presence of an endometrioma adversely affects the ovarian reserve and it may be difficult to measure these effects before surgery.22, 23Therefore, despite the efforts of laparoscopic surgeons to minimize surgical damage, the ovarian reserve can still suffer in the presence of endometrioma by itself.