What do the results mean?
If your CSF IgG index shows higher than normal levels, it may indicate:
Multiple sclerosis
Another autoimmune disease, such as lupus or rheumatoid arthritis
Chronic infection such as HIV or hepatitis
Multiple myeloma, a cancer that affects white blood cells
If your IgG index shows lower than normal levels, it may indicate:
A disorder that weakens the immune system. These disorders make it hard to fight infections.
If your IgG index results are not normal, it may not mean you have a medical condition needing treatment. Results can vary depending on a variety of factors including your age and overall health, and medicines you are taking. If you have questions about your results, talk to your health care provider.
Learn more about laboratory tests, reference ranges, and understanding results.
