A 2-year-old girl with Pierre Robin sequence, a gastric tube, and a tracheostomy and ventilator was admitted to the hospital medicine service. She had presented with a dislodged gastric tube, and on presentation she was lethargic, mildly febrile, and tachycardic, with normal blood pressure for age and oxygen saturations of 95% to 100% on her home ventilator settings. Her laboratory tests in the...