<prompt> Xanthochromia of CSF seen in all except:Bloody tapCaroteneIncreased antibodiesIncreased proteins  <response>: Ref: Harrisons Principles of Internal Medicine, 18th ed, page 46-1Explanation:Xanthochromia is yellow discoloration of CSF supernatant. Seen in:SAHJaundiceIncreased proteins 1.5-2 gLFroins syndrome spinal subarachnoid block, xanthochromia excess proteinsCarotene addictionBloody tap Vs SAHBloody tapSAHCSF clears on centrifugationXanthochromic supernatant CSFBlood clears in subsequent tubesUniformly bloody in all the tubesCauses of high CSF protein:Guillian-Barre syndrome GBSSpinal tumorsMeningitisMultiple sclerosisAcoustic neuromaAlbumino-cytological dissociation seen in GBS CONTRAINDICATIONS: Patient needs neuroimaging before LP-Altered level of consciousnessPapilledemaFocal neurological deficitNew-onset seizureImmunocompromised stateLocal skin infectionPlatelet count 20,000cmmCSFNormal ValuesPROTEIN15- 50mqdLGLUCOSE40-7Dmg.dLCELLS0-5: L MPRESSURE5-18 cm H20VOLUME150 mL 