To detect HIV antibodies in the blood, a number of different tests have been developed. Two of the most widely used tests are the ELISA (Enzyme Linked Immuno Sorbent Assay) and the Western Blot Kit Test.
HIV testing services are now available in most countries. There are many Voluntary Counseling and Testing Centers (VCTC). The referral and counseling services are mostly provided by the NGOs. In some places, there are collaboration between the NGOs and the government for referrals and linkages.
VCTC services have been extended rapidly in West Bengal during the last few years. Presently, 22 VCTCs including one community based VCTC are functioning in the state.