Hmm I don't know them all, but I believe Dr G tests for:
NK cells, but also tests with different drugs to see how your NK cells react to different drugs, not just steroids
Cytokine ratio (TH1:TH2) test
DQ Alpha Genotype (DQa) tests to see if your baby's dna would be a match of yours causing a rejection
LAD testing (measures the level of anti-paternal blocking antibodies in your blood)
Greek testing on menstrual blood for hidden infections
And possibly others, I'm not sure. Do you know of Agate's excellent FAQ on the whole immunology testing, here: www.fertilityfriends.co.uk/forum/index.php?topic=242395.0 I'm sure you do, but just in case!