There have been threads about this in the past - I think both general and Chiang Mai specific.
I reread them and made notes, but it's extremely difficult and confusing to compare prices.
Many of the testing labs have websites with text in Thai and I couldn't find any way to change the language to English.
One lab has extensive writeups in English about the testing, but a search of the site revealed no prices.
Etc.
As I recall, there is (at least in general) no "STD packages" - everything is a la carte and some seem insanely expensive
1 lab which was recommended in 1 thread has an HIV test priced at 2500 THB, a price that would keep many from getting the test.
In the US one finds County Health Services and NGO's offering such tests for free or very little.
Has anyone done a price comparison of at least a few labs and come up with one with a fairly complete list of tests available at a better price than the others?
Hopefully with some English speaking staff.
Although 1 poster said that some cheaper labs do not have their equipment calibrated frequenty enough and to make sure they are "certified".
Any suggestions on where to go?