would suggest you ask them as different operators will have different tests done. Basic haematology and biochemistry (full list of tests like to be rather long), Liver function likely along with cholesterol a possibility. Tests for drugs also likely but they should tell you what they are testing for. Urine for blood, protein and various other things
I may be getting the wrong end of this stick. Much of this is done for the issue of your pilot's licence so might not be done for pre-employment