Q: While performing LP (Lumbar puncture) you encountered Green color CSF fluid. What may be the cause of it?

Answer: Hyperbilirubinemia. Purulent CSF may also sometime appears Green. It should be read with other values in CSF.

The cerebrospinal fluid (CSF) is produced from arterial blood by the choroid plexuses of the lateral and fourth ventricles by a combined process of diffusion, pinocytosis and active transfer. The total volume of CSF in the adult is about 140 ml. The volume of the ventricles is about 25 ml. CSF is absorbed across the arachnoid villi into the venous circulation.The rate of absorption correlates with the CSF pressure.