A gastroscopy in Bangkok runs from about 19,000 baht, a colonoscopy from 29,000, and the combined procedure from 39,000 — but biopsy and deep sedation are usually billed separately. Wellmap's verified option in Thailand is Phyathai 2 Hospital, a full-service international hospital.
Colonoscopy prices for Turkey range from $150 to over €1,000 depending on the source — so compare what's included, not the headline. Turkey's two verified gastroenterology clinics are a metabolic surgery centre in Istanbul and a regional hospital in Trabzon.