Cerebrospinal Fluid Immunoglobulin Free Light Chains (Ig Free Light Chains)

Why This Test Is Done

Your healthcare provider may order this test if you have symptoms like headaches, neurological problems, or a suspected plasma cell disorder. It’s also used to check for abnormalities in the CSF that could indicate conditions like multiple myeloma, lymphoma, or other immune system issues.

What to Expect Before the Test

You’ll have a small needle inserted into your back to collect CSF through a procedure called a lumbar puncture. You may feel pressure or mild discomfort, but it’s usually over quickly. No special preparation is needed, but inform your provider about any medications or allergies.

What the Test Results Mean

Abnormal levels of free light chains in CSF can signal conditions like multiple myeloma, where plasma cells produce too many light chains. Elevated levels may also be linked to other disorders affecting the immune system or nervous system, but results must be interpreted by a healthcare provider with clinical context.

Common Conditions Monitored

This test is often used to diagnose or monitor multiple myeloma, a cancer of plasma cells, or other plasma cell dyscrasias. It may also help assess conditions like primary amyloidosis or other immune-related disorders affecting CSF.