I am still a bit confused as to what Clinkaty wants to know, so it is difficult to give an informative answer. It will be, I imagine, an immune response test to a specific challenge, but the OP doesnt really specify. It will almost certainly be a based on a test using blood though.
As to ESR - It is a fairly crude, non- specific screening test, and can be useful in determining the presence of an inflammatory response in the body, or as a consequence of a lymphoproliferative disorder where the reported ESR will be high.
Wiki has a reasonable page about it, if you are interested.
http://en.wikipedia.o...te_sedimentation_rate