last time when i went there, they only need my HKID, 醫生証明,住址証明. there were not many people when i went there on sat. after registration, they asked me if i had time to see a nurse, i said yes. the nurse asked me some questions about my health history, last m date, etc. then, they took some blood and booked for the next consultation. it took me less than an hour.
their antenantal booking enquiry is 29586227 (9am to 5pm).
hope it helps!!