Cerebrospinal Fluid (CSF) Protein by Electrophoresis

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like headaches, vision changes, numbness, weakness, or balance issues that could suggest a problem in your brain or spinal cord. It’s also used to monitor conditions like multiple sclerosis, meningitis, or other neurological diseases where protein levels in CSF can be key to diagnosis or treatment planning.

What to Expect During the Test

A small amount of cerebrospinal fluid is collected through a procedure called a lumbar puncture (spinal tap). You’ll lie on your side with your back bent slightly, and a needle is gently inserted into your lower back to draw the fluid. The process is quick but may cause mild discomfort. The collected fluid is then sent to the lab for analysis.

Understanding Your Results

The test separates proteins into bands (like zones) based on size and charge. Normal CSF protein levels are generally lower than blood, and the pattern should show a few main protein types. Abnormal patterns—such as high amounts of immunoglobulin G (IgG) or other proteins—may indicate inflammation, infections, or demyelinating diseases.

Common Conditions Linked to Abnormal Results

High protein levels in CSF might suggest conditions like meningitis, encephalitis, or tumors. Low protein levels could indicate conditions like Guillain-Barré syndrome or certain types of brain swelling. Uneven protein bands may point to autoimmune diseases like multiple sclerosis or other neurological disorders affecting the myelin sheath around nerves.