Hysterescopy D&C test

Hi, the fertility clinic gynae wants to do a Hysterescopy D&C under general anesthesia.

This appears to be one of the tests he was checking if I had done even before examining me. I have done the iodine test, laparoscopic surgery, vulvar scan. All were clear no PCOS, endometriosis or blocked tubes.

What will this investigation show that is not covered in the above tests?