What is primarily performed to gauge the patency of the fallopian tubes?

The primary procedure for gauging the patency of the fallopian tubes is the Rubin test. This test involves introducing a gas or fluid into the uterus and assessing whether it can pass through the fallopian tubes, indicating that they are open (patent). The ability to confirm tubal patency is crucial for diagnosing infertility, as blocked tubes can prevent sperm from reaching the egg or hinder the passage of a fertilized egg to the uterus.

Other procedures listed serve different purposes: trachelorrhaphy is a surgical procedure to repair the cervix, culdoscopy is used to visualize the pelvic organs through the vagus, and the Huhner test assesses the interaction between sperm and cervical mucus rather than directly evaluating the fallopian tubes. Thus, the Rubin test is specifically designed to determine tubal patency, making it the correct answer in this context.