I do see a pediatric endo.  I am trying to switch doctors now because I am very unsatisfied with who he sees now.  I have never even heard of the other test.  His electrolytes are good from what I have been told... Sodium  138 and Potassium 4.4. His 17ohp level was 13.  They said that was a little high but he was getting a cold at the time so I hope that otherwise it is ok.