Color of CSF supernatant	Conditions or causes
Yellow	Blood breakdown products
	Hyperbilirubinemia
	CSF protein ≥150 mg per dL (1.5 g per L) >100,000 red blood cells per mm3
Orange	Blood breakdown products
	High carotenoid ingestion
Pink	Blood breakdown products
Green	Hyperbilirubinemia
	Purulent CSF
Brown	Meningeal melanomatosis