Success! In Clinical Laboratory Science – Urinalysis and Body Fluids (UA/BF) Practice Test

Normal CSF cell count is 0–5 cells per microliter in healthy adults. The CSF normally has very few cells because the blood-brain barrier limits entry of immune cells into the central nervous system. When the count rises above this range, it suggests an abnormal process such as infection, inflammation, hemorrhage, or malignancy. That makes the 0–5 cells/µL range the best fit. The other ranges imply normal greater numbers or are clearly elevated beyond normal. (Note: neonatal ranges can be higher, but for adults the 0–5 cells/µL range is standard.)