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Tobey Ayer test

Last reviewed dd mmm yyyy. Last edited dd mmm yyyy

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The Tobey Ayer test is for a block in the spinal canal.

Pressure is applied to the neck in order to compress the internal jugular veins; this reduces venous outflow from the cranium and raises the intracranial pressure. A spinal puncture will displace CSF into the spinal sac and cause the measured CSF pressure, e.g. by manometer, to rise rapidly. This is not seen if a spinal block to the flow of CSF is present, as in Froin's syndrome.

The test is very unreliable.

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