first of all i want to tell that chalmydia is different species, is a intracellular parasite, not a bacteria.. so it is not possible to culture easily.
The first of tests antigen detection is done , generally of chlamydia lipopolysaccharide (LPS) or MOMP, as a means of detecting chlamydial elementary
bodies or antigens in genital specimens. The most widely used of these assays are the DFA and enzyme immunoassay
culture is specific but not done routinely because of simple and more sensitive/specific tests are available...
hope it will help