Cerebrospinal Fluid (CSF) Red Blood Cell Count (Manual Cell Count)

Why This Test Is Done

Your doctor may order this test if you have symptoms like severe headaches, neck stiffness, confusion, or neurological problems. It’s also used to monitor conditions like meningitis, subarachnoid hemorrhage, or traumatic brain injury.

What to Expect Before the Test

No special preparation is needed. You may have a lumbar puncture (spinal tap) to collect the CSF sample. This procedure involves inserting a needle into your lower back to draw fluid. You might feel pressure or discomfort, but it’s usually brief.

What the Test Results Mean

Normally, CSF contains very few red blood cells. Elevated counts may indicate bleeding in the brain or spinal cord, infections, or other conditions affecting the central nervous system. Your doctor will interpret results in the context of your symptoms and medical history.

Possible Causes of Abnormal Results

High red blood cell counts in CSF can be caused by traumatic lumbar puncture, bleeding disorders, subarachnoid hemorrhage, or inflammatory conditions like meningitis. Low counts may occur if the sample was contaminated or if the test was not performed correctly.