Fig. 3

Diagnostic algorithm for nonhepatic hyperammonemia. Diagnostic algorithm, showing the first steps for diagnosing the cause of nonhepatic hyperammonemia (based on studies by Ruby Upadhyay, Thomas P. Bleck, and Katharina M. Busl [10]; Jamie Nicole LaBuzetta, Phil Jay Z. Yao, Daniel L. Bourque, and JustinZivin [13]; and Alison S. Clay and Bryan E. Hainline [14])