Diagnostic Hystero-Laparoscopy (DHL) combined with Chromopertubation (CPT) is an advanced procedure used to evaluate the causes of infertility. It helps in examining the uterus, fallopian tubes, ovaries, and pelvic cavity with precision. CPT involves passing a special dye into the uterus to check if the fallopian tubes are open, which is a key step in assessing fertility.