VDRL test for diagnosis of syphilis is an example for
VDRL- Flocculation test Though flocculation also is a type of precipitation, flocculation is ideal for VDRL In which floccules are suspended after formation of antigen-antibody complex Ref: Textbook of Microbiology Baveja 5th ed Pg 120
Precipitation test
Agglutination
Immunofluorescence
Flocculation
Immunology