They are looking for a ton of different things. It would be impossible for me to list for you everything they are looking at. There is no reason to worry about all these tests before you get the results back. When you get the results back I'd be happy to look at them and analyze them. These tests will not show lactose intolerance though.
The test for lactose intolerance is a hydrogen breath test but there is no reason to do that, all you need to do is to eliminate 100% of all lactose from your diet for 2 weeks and if that helps then you have lactose intolerance and if that doesn't help then you don't have lactose intolerace. It is normal to test for parasites.