A 13-year-old patient presents to the emergency department in a disoriented state with tachycardia, tachypnea, hypotension, and hypothermia. Upon assessment, the nurse notes the patient’s breath smells like acetone, the mucous membranes are dry, and the patient has poor skin turgor. The nurse knows which test is the priority?

The patient with a central venous catheter develops substernal chest pain, hypotension, and cough. There is evidence of air in the line. Which action does the nurse take first​?

Which is indicated by a positive urea breath test?