Evaluation is clinical and based upon the patient's history.
BMP to evaluate dehydration/electrolyte abnormalities if significant amount of vomiting
CT head (if concern for stroke/hemorrhage)
Motion sickness
Benign paroxysmal positional vertigo
Decompression sickness
Meniere Disease
Allergic rhinitis
Vestibular neuritis
Chronic mountain sickness
Labyrinthitis