VDRL is an abbreviation for Venereal Disease Research Laboratory, and RPR is an abbreviation for Rapid Plasma Reagin. The VDRL test is used to determine whether a person has syphilis. The bacterium Treponema pallidum causes syphilis. The bacterium infects by invading the mouth or vaginal region lining. It detects antibodies, which are things (proteins) that the body may produce if exposed to syphilis-causing bacteria. The VDRL test is generally suggested for persons who actively engage in unprotected sexual activities in Delhi or any other city. The VDRL RPR test in Delhi or any other city does not screen for syphilis-causing bacteria. Instead, it looks for antibodies produced by an individual's body in response to antigens released by bacteria-damaged cells. A VDRL RPR in Delhi or any other city is relatively affordable; thus, it is best to select a renowned laboratory for an accurate and dependable test.