The patient presents with symptoms of a cerebrovascular accident. The nurse anticipates further testing will reveal blockage of which vessel?

The 62-year-old male patient presents to the office complaining of difficulty urinating, with a weak stream, waking multiple times in the night to urinate, and the feeling of not completely emptying the bladder that has been occurring for months. Which test must be performed first for this patient? 

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?