Can you name and describe the 3 types of serological tests?

Answer 1

Western Blot
(The Northern and Southern blot tests are for DNA and RNA)

ELISA

Immunohistochemical stain

But then you could just do serial titrations and stuff as well - why only "the 3 types" of serological tests? The lab at the hospital I worked in used a serological CRP test as well. *shrug*