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VDRL test is an example of

  • A.Tube test
  • B.Ring test
  • C.Slide test
  • D.none of these

Answer: C

Correct answer: Slide test

The VDRL test is performed by mixing a drop of heat-inactivated serum with cardiolipin antigen on a glass slide and rotating it, the flocculation being read under the microscope. It is a slide flocculation test, which is what makes it quick and cheap enough for the mass screening it was designed for. Being non-treponemal it detects reagin rather than antibody to the organism, so a reactive result needs confirming.

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