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 issues, or signs of a blood disorder. It’s often used alongside other tests to check for conditions like multiple myeloma, lymphoma, or other immune-related diseases affecting the central nervous system.

What to Expect Before the Test

No special preparation is needed. A healthcare professional will collect a small sample of your cerebrospinal fluid (CSF) through a procedure called a lumbar puncture (spinal tap). This involves lying on your side and having a needle inserted into your lower back to draw fluid.

What the Test Results Mean

Abnormal levels of free light chains in CSF can indicate conditions like multiple myeloma, where abnormal plasma cells produce too many light chains. Elevated levels may also suggest other immune disorders or infections. Your results will be compared to what’s expected for your age and health.

Common Conditions This Test Helps Diagnose

This test is particularly useful for diagnosing multiple myeloma, a cancer of plasma cells, or other conditions like primary central nervous system lymphoma. It can also help monitor treatment progress or detect recurrence.