Dr. Lok Yee Ha is very good, she is in Union Hospital, you can join the maternity package (around $6500 for 12 examinations plus some other tests and includes maternity vitamine pills, etc...), please check www.union.org or call 26083250 for more details.
He charge around $800-900 per regular checking. For 4D scan, he will charge around $1000 for his regular patient and $1200 - 1500 for one time 4D scan patient. However, he is expensive but it worth. Because he is really professional. I can get down to walk on the 2nd day after my son borned.