I was on OA for few years befor I change to DTV ,and never required a chest X-ray. Just needed a general medical certificate which is a form and GP sign it for me. Unless it's a new thing that I don't know about it.
Hi، i did apply in Hanoi، with dentist appointment. I only provide the appointment slip from Bangkok hospital. My hotel booking in Hanoi. My Thailand accommodation agreement، and of course the babk statement. My visa was ready 3day،s later.