Which statement best describes normal cerebrospinal fluid?

Which statement best describes normal cerebrospinal fluid?

• A. Colorless and Odorless with Small Amounts of Protein and Glucose, Minimal WBCs, No RBCs, and No Microorganisms
• B. Cloudy, Yellow CSF with High RBCs
• C. Green, Foul Odor CSF
• D. Opaque CSF with Visible Crystals

Answer: (C)

Normal cerebrospinal fluid is a clear, colorless, and odorless liquid that cushions the brain and spinal cord. It should have only small amounts of protein, glucose roughly equal to two-thirds of the plasma glucose, and very few cells—ideally no red or white blood cells and no microorganisms. This calm, sterile profile indicates there is no infection, inflammation, or bleeding in the central nervous system. Descriptions that mention cloudiness or yellow coloration with red cells suggest bleeding or infection (cloudy with elevated white cells or protein often points to meningitis; yellowing can reflect breakdown products after bleeding). A green color with a foul odor and an opaque appearance with crystals are not typical of normal CSF and imply infection, contamination, or other pathology.

Normal cerebrospinal fluid is a clear, colorless, and odorless liquid that cushions the brain and spinal cord. It should have only small amounts of protein, glucose roughly equal to two-thirds of the plasma glucose, and very few cells—ideally no red or white blood cells and no microorganisms. This calm, sterile profile indicates there is no infection, inflammation, or bleeding in the central nervous system.

Descriptions that mention cloudiness or yellow coloration with red cells suggest bleeding or infection (cloudy with elevated white cells or protein often points to meningitis; yellowing can reflect breakdown products after bleeding). A green color with a foul odor and an opaque appearance with crystals are not typical of normal CSF and imply infection, contamination, or other pathology.