Several blood-based HIV tests are available:
ELISA or EIA for initial screening
Western blot to confirm the diagnosis
Other, newer blood tests.
Screening Tests: ELISA or EIA HIV
HIV testing consists of an initial screening with two types of blood tests commonly used to detect an infection. The most commonly used initial blood test is an enzyme immune assay (EIA) or the enzyme-linked immunosorbent assay (ELISA) test. If EIA test results show a reaction, the test is repeated on the same blood sample.
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