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CSF IgG Index in Multiple Sclerosis

CSF IgG Index is a other marker reported as elevated in Multiple Sclerosis when patients are compared with the reference group of the cited comparison (MS vs healthy (diagnostic marker)). The source does not tie this marker to a specific symptom cluster, so it is best read as a biological signal rather than a symptom predictor. The finding is drawn from Saadeh et al. 2022; it describes group-level differences, not a threshold that classifies an individual.

↑ ElevatedOther

Summary

Direction in Multiple Sclerosis↑ Elevated — higher than in the comparison group
CategoryOther
Compared againstMS vs healthy (diagnostic marker)
SourceSaadeh et al. 2022 — doi:10.1093/clinchem/hvac061
Condition atlasMultiple Sclerosis Biomarker Atlas

Related Other markers in Multiple Sclerosis

Full list: Multiple Sclerosis Biomarker Atlas.

Frequently asked questions

Is CSF IgG Index high or low in Multiple Sclerosis?

Elevated. Studies summarised in the OSMF atlas report higher CSF IgG Index in Multiple Sclerosis than in the reference group of the cited comparison (MS vs healthy (diagnostic marker)). Source: Saadeh et al. 2022.

Which test measures CSF IgG Index?

The atlas record does not list a standardised clinical test code (LOINC) for CSF IgG Index, which usually means it was measured with research assays or study-specific protocols rather than a routine clinical panel. Check the cited source for the exact method.

Is one abnormal CSF IgG Index result diagnostic of Multiple Sclerosis?

No. No single biomarker is diagnostic of Multiple Sclerosis. CSF IgG Index findings come from group comparisons, overlap considerably between patients and controls, and vary with study design, timing and comparison group. A result should be interpreted by a clinician alongside symptoms, history and other tests.

Cite this page

Open Source Medicine Foundation. (2026). CSF IgG Index in Multiple Sclerosis: direction, evidence and what it means. OSMF Research Tracker. Retrieved October 7, 2026, from https://research.opensourcemed.info/biomarkers/multiple-sclerosis/csf-igg-index.html
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Last reviewed: 2026-07-03 · Page generated from multiple-sclerosis.json · Browse: Multiple Sclerosis atlas · Biomarker Index · All marker pages

Disclaimer: This page is an educational synthesis of published, peer-reviewed research and is not medical advice. Biomarker findings vary across studies with case definitions, comparison groups, timing and assay methods. Direction of change reflects the predominant finding in the cited source and does not establish a diagnostic threshold. Discuss any test result with a qualified clinician.