Q; During lumbar puncture (LP), what is the normal rate of cerebrospinal fluid (CSF) escape via needle into the collecting tube?
Answer; One drop per second
While performing LP, CSF should drop into tube with approximate rate of one drop/sec. A continuous stream of CSF indicates raised intrameningeal pressure.
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References:
1. Doherty CM, Forbes RB. Diagnostic Lumbar Puncture. Ulster Med J. 2014 May;83(2):93-102. PMID: 25075138; PMCID: PMC4113153.
2. Boyles TH, Gatley E, Wasserman S, Meintjes G. Brief Report: Flow Rate of Cerebrospinal Fluid Through a Spinal Needle Can Accurately Predict Intracranial Pressure in Cryptococcal Meningitis. J Acquir Immune Defic Syndr. 2017 Mar 1;74(3):e64-e66. doi: 10.1097/QAI.0000000000001183. PMID: 28187086.
3. Ellis RW 3rd, Strauss LC, Wiley JM, Killmond TM, Ellis RW Jr. A simple method of estimating cerebrospinal fluid pressure during lumbar puncture. Pediatrics. 1992 May;89(5 Pt 1):895-7. PMID: 1579400.
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