Any practitioner should have already gotten you to get a barrage of tests done anyway. My natural therapies practitioner gave me the list of what they needed, I went to a bulk-billing GP and asked for them, then took the results back to the naturopath. I've got levels that the GP say are within the normal range (which they are) but they are either too low in the scale or too high in the scale, which is impacting on me. So in conjunction with my naturopath (and a couple of my lecturers at uni) we are doing a few things to get levels more mid-range.