In the Bangkok area, most outpatient clinics are located within hospital compounds. The sort of stand alone clinic/doctor practice you have in mind, is not the norm here. There are stand alone labs, but these do not have doctors on staff to review your results with you and advise. Within central Bangkok there are some clinics but these mainly do check ups and health certificates or else specialize in things like cosmetic procedures or STIs...and are some distance from Rangsit. Most medications in Thailand -- including for hypertension and diabetes -- do not require a prescription, you just buy at pharmacy. Likewise, you do not need a doctor's order to get blood work at a stand-alone lab here. But, except for check up packages, you would need it to get blood work at most hospitals. So how best to proceed really depends on whether you are looking for a doctor to oversee your care at very frequent intervals, or just for periodic labs and medications and perhaps infrequent doctor consultation when/if results vary from your norm. Assuming you do need/want physician advise (and were not just asking for prescription purposes, which do not apply here), then in Rangsit area, I would suggest you go to either: (1) (private option) https://www.paolohospital.com/th-TH/rangsit/Home https://www.patrangsit.com/en/home/ (2) (government hospitals) https://www.hospital.tu.ac.th/en/page/about-hospital/ At government hospital, cost will be low (well under 1000 baht for labs + consultation; meds would vary depending on what you are on). But process takes longer and there is red tape etc. Best to have a Thai speaker with you at least the first time. At private hospital, labs + consultation will be around 3000 baht de3pending on what labs and what doctor. Do not buy meds at a private hospital, there is substantial mark up. If you just want labs and meds in most instances, and not doctor visit each time, then I would go here for labs: https://www.brianet.com/en/map-and-contact/ And for meds, plenty of pharmacies in Rangsit area. Just chose one that is air conditioned.
