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Positional testing provides information regarding development of nystamus when your head is placed in certain positions. A minimum of five (5) and often seven (7) positions are used in a standard VNG (videonystagmogram) protocol. These positions include:
The protocol for positional testing involves wearing the infrared video goggles and eye movements are monitored for 30-60 seconds when placed in each position. Testing in this manner gives us information about positional or positioning nystagmus. This is the portion of the evaluation which determines the presence of BPPV. However, there are many disease states other than BPPV that cause vertigo and/or nystagmus that is positional. Thus the importance of visualizing the type and characteristics of any nystagmus that develops in each head position.