Dr. Elie Naddaf interviews Dr. Andrea Boon about the approach to patients presenting to the EMG laboratory with respiratory symptoms, to evaluate for underlying neuromuscular cause of these symptoms. Dr Boon describes the role of phrenic nerve conduction studies and needle electromyography of the diaphragm and the technical limitations of these studies. Dr Boon also details the role of diaphragm ultrasound to enhance the accuracy and safety of diaphragm electromyography, and improve the diagnostic yield of EDX testing, including an overview of the diaphragm ultrasound technique