CSF tap test

The CSF tap test, sometimes lumbar tap test or Miller Fisher Test, is a medical test that is used to decide whether shunting of cerebrospinal fluid (CSF) would be helpful in a patient with suspected normal pressure hydrocephalus (NPH). The test involves removing 30 mL of cerebrospinal fluid (CSF) through a lumbar puncture, after which cognitive function is clinically reassessed. The name "Fisher test" is after C. Miller Fisher, a Canadian neurologist working in Boston, Massachusetts, who described the test.[1]

CSF tap test
Lumbar puncture
SynonymsLumbar tap test
Purposetest to decide shunting of cerebrospinal fluid

Clinical improvement showed a high predictive value for subsequent success with shunting. A "negative" test has a very low predictive accuracy, as many patients may improve after a shunt in spite of lack of improvement after CSF removal.[2]

References
  1. Collins LG, Rovner BN, Marenberg MM (2009). "Evaluation and Management of Dementia". In Arenson C, Busby-Whitehead J, Brummel-Smith K, O'Brien JG, Palmer MH, Reichel W (eds.). Reichel's care of the elderly : clinical aspects of aging (6th ed.). Cambridge: Cambridge University Press. p. 180. ISBN 9780521869294.
  2. Wikkelsø, C., Hellström, P., Klinge, P. M., Tans, J. T. J., & European iNPH Multicentre Study Group (2013). "The European iNPH Multicentre Study on the predictive values of resistance to CSF outflow and the CSF Tap Test in patients with idiopathic normal pressure hydrocephalus". Journal of Neurology, Neurosurgery, and Psychiatry. 84 (5): 562–568. doi:10.1136/jnnp-2012-303314. PMID 23250963. S2CID 6335882.{{cite journal}}: CS1 maint: multiple names: authors list (link)
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