Inclusion Criteria:  Written informed consent obtained Age ≥ 18 years and ≤ 80 years Women undergoing primary surgery for suspected High grade serous carcinoma (HGSC) If premenopausal in luteal phase (minimum 14 days after last day of menstrual period) or: Women with high risk for breast or ovarian cancer (HBOC) undergoing prophylactic resection of tubes with or without ovaries. If premenopausal in luteal phase except amenorrhea under hormonal contraception (incl. levonorgestrel -IUD)  Exclusion Criteria:  Incapacitated women Pregnant women Prior hysterectomy Prior bilateral salpingectomy Prior tubal ligation First half of menstrual cycle Interval debulking Current cytotoxic chemotherapy