Cerebrospinal Fluid (CSF) Total Protein by Nephelometry

What Does This Test Measure?

Your cerebrospinal fluid (CSF) is analyzed to determine the total protein concentration. Protein is a group of molecules that play key roles in your body’s functions, including immune response and structural support. In CSF, elevated protein levels can indicate inflammation, infection, or damage to the blood-brain barrier.

Why Might This Test Be Ordered?

Doctors may order this test if you have symptoms like headaches, neck stiffness, confusion, or neurological problems. It’s also used to diagnose or monitor conditions such as meningitis, multiple sclerosis, or tumors in the brain or spinal cord.

Sample Collection and Preparation

A small amount of CSF is collected through a procedure called a lumbar puncture (spinal tap). This involves inserting a needle into your lower back to draw fluid into a sterile container. The test requires no special preparation, but you may be asked to fast or avoid certain activities for a short time before the procedure.

What Are Common Findings?

Normal protein levels in CSF are generally lower than in blood. Abnormally high protein levels may suggest conditions like Guillain-Barré syndrome, chronic meningitis, or certain brain tumors. Low protein levels are less common but could indicate conditions affecting fluid balance in the central nervous system.