"Clinicians should diagnose posterior semicircular canal BPPV when vertigo associated with nystagmus is provoked by the Dix-Hallpike maneuver (Bhattacharyya et al., 2008)."  

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Bhattacharyya et al., 2008 makes a strong recommendation based on diagnostic studies with minor limitations and a preponderance of benefit over harm (Bhattacharyya et al., 2008).  



The Dix-Hallpike maneuver is considered the gold standard test for the diagnosis of posterior canal BPPV (Bhattacharyya et al., 2008).