| CSF tap test | |
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Lumbar puncture
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| Synonyms | Lumbar tap test |
| Purpose | test to decide shunting of cerebrospinal fluid |
The CSF tap test, sometimes lumbar tap testorMiller 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 30-50 ml of cerebrospinal fluid (CSF) through a lumbar puncture, after which motor and cognitive function is clinically reassessed.[1] The name "Fisher test" is after C. Miller Fisher, a Canadian neurologist working in Boston, Massachusetts, who described the test.[2]
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.[3]
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Tests and procedures involving the central nervous system
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| Skull |
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| Brain |
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| Meninges |
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| Spinal cord and spinal canal |
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| Imaging |
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| Diagnostic |
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| Clinical prediction rules |
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