In the previous year, about 24% of the full sample had received HIV testing. The proportion of those at high risk who had been tested was similar. Relative to 100% condom programme [2,3] or efforts to prevent mother to-child transmission [32], voluntary counseling and testing (VCT) has received less attention, although these services are currently available at all provincial and community hospitals [31]. There are no other published data about VCT utilization among Thai adults; therefore, it is difficult to judge how our data relate to overall trends. Barriers and facilitators of testing also have not been investigated and warrant further attention