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How many drops of CSF is enough?
  1. P G McIntyre
  1. Medical Microbiology, Ninewells Hospital & Medical School, Dundee DD1 9SY, UK
  1. Correspondence to:
 Paul G McIntyre
 Medical Microbiology, Ninewells Hospital & Medical School, Dundee DD1 9SY, UK; paul.mcintyre{at}nhs.net

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Doctors in training are generally taught lumbar puncture at the bedside, at least “in my day”, using a “see one, do one, teach one” approach. The volume of cerebrospinal fluid (CSF) to be taken was elaborated to me as follows: three drops for bacteriology and three drops for biochemistry, and if the first aliquot is bloody then another three drops for bacteriology to try to differentiate traumatic trap from blood in the …

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