The neurosurgeons got one of the pediatric hospitalists involved since the issues he's having don't seem to be related to his surgery. His incision looks great and everything went really well in the OR. They are ordering more labs and he will probably have a nephrology consult to make sure there's nothing going on with his kidneys. The labs they ran so far haven't shown any issues with his kidneys but they are going to start digging to find the cause(s) of his issues.
That's all I've got for now but I'll try to keep the updates coming.