A nurse is performing tests to aid in the confirmation or exclusion of a stroke. Which tests may indicate the patient is experiencing a stroke mimic? Select all that apply.

The patient is brought to the emergency department following a fire in his home. The nurse notes that the patient has singed facial hair and soot on his face. He is mildly tachypneic, his lung sounds are clear and equal, and the nurse notes pronounced stridor. His oxygen saturation is 90% on room air. Patient also complains of a sore throat and severe pain in his arms and hands, which have about 50% of their area covered by burns. Which of the following is the next best step in management?

The patient experiencing an oversecretion of vasopressin presents with a decrease in which laboratory value?