Gynaecology & Obstetrics General f9c3e445 Regarding saline infusion sonography, all are true except A Best performed within first 10 days of menstrual cycle. B Timing of procedure is cycle dependent in all women C SIS in initial days of cycle, precludes disturbing a potential pregnancy D SIS is optimally done on cycle days, 4,5 or 6 because the lining is thinnest High-Yield Explanation For post-menopausal woman, timing of procedure is not cycle - dependent.