<prompt> All are tubal patency tests EXCEPTTubal CO2 insufflation testLaproscopyFern testHSG  <response>: Ans. c Fern test. Ref. Shaws, Textbook of Gynaecology, 12thpg.l62Tests for tubal patencyTests for ovulation1CO2 insufflationRubins test obsoleteBBT2HSGEndometrial biopsy3Laproscopic chromopertubationFern test4Sonosalpingography and standard USGFolliculometry USG -noninvasive, accurate, safe5HysteroscopyHormonal study progesterone, LH and prolactin6Transcervical falloscopy 7Ampullary and fimbria! salphingoscopy 