A CSF cell count is a test to measure the number of red and white blood cells that are in cerebrospinal fluid (CSF). CSF is a clear fluid that circulates in the space surrounding the spinal cord and brain.
Other methods for collecting CSF are rarely used, by may be recommended in some cases. They include:
After the sample is taken, it is sent to a laboratory for evaluation.
See: Lumbar puncture
See: Lumbar puncture
The CSF cell count may help diagnose meningitis and infection of the brain or spinal cord, a tumor, abscess, or area of tissue death (infarct), and it helps identify inflammation. The cell count may also help identify bleeding in the spinal fluid.
The normal white blood cell count is between 0 and 5. The normal red blood cell count is 0.
Note: Normal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.
The examples above show the common measurements for results for these tests. Some laboratories use different measurements or may test different specimens.
An increase of white blood cells indicates infection, inflammation, or bleeding into the cerebrospinal fluid. Some causes include:
Finding red blood cells in the CSF may be a sign of bleeding. However, red blood cells in the CSF may also be due to the spinal tap needle hitting a blood vessel while entering the skin or dura.
It is important to see if the red blood cell count returns to normal in samples taken later in the procedure as opposed to earlier. A ratio of the red blood cells to the white blood cells is also calculated to help with diagnosis.
Additional conditions which this test may help diagnose include:
Risks of lumbar puncture include:
Brain herniation may occur if performed on a person with a mass in the brain such as a tumor or abscess. This can result in brain damage or death. For this reason, a lumbar puncture is not done if other tests show signs of a tumor or abscess.
There may be temporary leg discomfort if a nerve root is irritated by the needle. This passes when the needle is withdrawn.
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Rosenberg GA. Brain edema and disorders of cerebrospinal fluid circulation. In: Bradley WG, Daroff RB, Fenichel GM, Jankovic J, eds. Bradley: Neurology in Clinical Practice. 5th ed. Philadelphia, Pa: Butterworth-Heinemann Elsevier; 2008:chap 63.