Anonymous versus confidential HIV testing: client and provider decision making under uncertainty.

Six intensive observational studies of HIV testing sites were undertaken in order to improve understanding of confidential and anonymous testing. Three sites offered only confidential testing (a large health maintenance organization's Urgent Care clinic, the same organization's HIV clinic, and a private medical practitioner's office), one offered only anonymous testing (a free clinic), and two offered a choice of confidential or anonymous testing (a thrift shop alternate testing site and a mobile testing unit). Multiple data collection strategies were used including direct field observation, semistructured interviews with clients and providers, and document and policy analysis.