Cerebrospinal Fluid Red Blood Cell Count (Manual Microscopic Count)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like headaches, neck stiffness, vision changes, or neurological issues that could suggest bleeding, infection, or inflammation in the brain or spinal cord. It’s often part of a broader evaluation for conditions like meningitis, subarachnoid hemorrhage, or traumatic brain injury.

How the Test Works

A small sample of your CSF is collected through a procedure called a lumbar puncture (spinal tap). The sample is then examined under a microscope by a trained technician to count the red blood cells. Unlike automated blood counts, this method provides a detailed, manual count for accuracy.

What to Expect Before the Test

You’ll typically lie on your side with your knees bent to your chest. The procedure involves inserting a needle into your lower back to collect the CSF. You may feel pressure or a slight sting, but it’s usually not painful. You’ll be asked to lie still for a few minutes afterward to prevent bleeding.

What to Expect During the Test

The test itself is quick, usually taking less than 15 minutes. You’ll be monitored closely to ensure no complications occur. Afterward, you may feel mild soreness or a temporary headache, which can be managed with over-the-counter pain relievers.