Looking to do a colonoscopy.
I assume you mean you'll "have" one rather than putting on a gown and pulling on some gloves to "do" one on somebody else... although that sounds like an interesting way that medical tourism could go - you've seen Grey's Anatomy on TV, be a doctor for a day!
Seriously - medical tourism is big business in Thailand, just make sure you check the credentials of the provider and the credentials of the medical facility they intend to use. Ask them if they can provide you with contact details of past clients, and then call them yourself.
Fortunately the Bumrungrad International Hospital in Bangkok, which has a medical-tourism facility, is world-class. They have plenty of information about elective medical procedures on their website:
http://www.bumrungrad.com/ over 8 years ago
I was several times in the BNH Hospital. Good Standard. To find location and webpage of this and other recommended Bangkok hospitals go to http://map.top-travel-bangkok.com/bangkok_medical.php over 8 years ago
Bumrungrad International Hospital in Bangkok is very good. I have been there many times. Had minor surgery there. It appears to be at American standard.
From their website: "Bumrungrad was the first Asian hospital accredited by the Joint Commission International (JCI), the international arm of the organization that reviews and accredits American hospitals."
There may be other good ones there too, but I don't know these from personal experience. about 8 years ago