manometer equipped with a 3 way stop cock can be attached to the
hub of the LP needle after the needle is corrected inserted. An
assistant should ensure that the patient is relaxed as possible.
Extend the patient's leg gently and return the neck to a neutral
position with the head supported with a pillow.
CSF is then measured by recording the height of CSF in the manometer
pressures over 200 mm. H2O are likely abnormal but pressures
in the range of 200-250 mm. H2O are in a "grey zone".
CSF pressures can elevate by up to 50 mm. if the patient is anxious
or holds their breath.
the pressure is very high (>250 mm. H2O), insert the
stylet and remove the needle without taking any CSF. Use the CSF
already in the manometer for analysis.