https://medlineplus.gov/lab-tests/csf-immunoglobulin-g-igg-index/
CSF Immunoglobulin G (IgG) Index: MedlinePlus Medical Test
A CSF IgG index measures the level of some antibodies in your cerebrospinal fluid. It is used to help check for multiple sclerosis. Learn more.
immunoglobulin gigg indexcsfmedlineplusmedical