Clinical recommendations	Evidence rating	References	Comments
Use the Dix-Hallpike maneuver to diagnose BPPV.	C	7,10	The Dix-Hallpike maneuver has a positive predictive value of 83 percent and negative predictive value of 52 percent for the diagnosis of BPPV.
Do not use laboratory tests to initially identify the etiology of dizziness.	C	10	Laboratory tests identify the etiology of vertigo in less than 1 percent of patients with dizziness.
Consider radiologic studies in patients with neurologic signs and symptoms, risk factors for cerebrovascular disease, or progressive unilateral hearing loss.	C	19	—
Use MRI for diagnosing vertigo when neuroimaging is needed.	C	26	MRI is superior to computed tomography for the diagnosis of vertigo because of its superior ability to visualize the posterior fossa.