<prompt> VDRL is a type of: September 2010Indirect hemagglutination testSlide flocculation testGel precipitation testNone of the above  <response>: Ans. B: Slide flocculation test Venereal Disease Research Laboratory VDRL Test is a slide flocculation test employed in the diagnosis of syphilis. Since the antigen used in this test is cardiolipin, which is a lipoidal extracted from beef hea, it is not a specific test. This test is also classified as non-specific or non-treponemal or standard test. The antibodies reacting with cardiolipin antibodies have been traditionally but incorrectly termed regain. 