Abstract
Venereal disease research laboratory (VDRL) test is a nontreponemal test, used for screening of syphilis due to its simplicity, sensitivity and low cost. Prozone phenomenon and biological false positive (BFP) reaction are two shortcomings of this test. Quantitative estimation of VDRL is essential in treatment evaluation. CSF VDRL test is very specific for neurosyphilis though its sensitivity is low. Interpretation of VDRL in HIV infection is incompletely understood.