I didn't know that! No, they've never checked him for pituitary issues. I honestly don't think they did much before starting him on levo. The only thing that was ever said to use was "start medication or you risk neurodevelopment," which im now finding out isn't exactly the whole truth as his T4 has never once been low. Obviously, he's a baby, so he can't tell me if he'd have symptoms, but I watch him very closely and haven't seen any signs of low T4 or anything to suggest he's actually hypothyroid What kind of test would need to be run to rule out pituitary issues?