In CSF analysis for multiple sclerosis, which finding is commonly elevated?

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Multiple Choice

In CSF analysis for multiple sclerosis, which finding is commonly elevated?

Explanation:
The key idea is that MS causes increased immunoglobulin G production within the central nervous system. This intrathecal IgG synthesis is most commonly detected as oligoclonal IgG bands on CSF analysis and a high CSF IgG index, reflecting more IgG in CSF relative to serum. That intrathecal synthesis is the most characteristic CSF finding in MS, which is why elevated CSF IgG is the best match among the options. Mild lymphocytosis can occur but is not a defining feature and may be absent; CSF protein can be normal or only mildly elevated; MRI is a diagnostic imaging test, not a CSF finding.

The key idea is that MS causes increased immunoglobulin G production within the central nervous system. This intrathecal IgG synthesis is most commonly detected as oligoclonal IgG bands on CSF analysis and a high CSF IgG index, reflecting more IgG in CSF relative to serum. That intrathecal synthesis is the most characteristic CSF finding in MS, which is why elevated CSF IgG is the best match among the options.

Mild lymphocytosis can occur but is not a defining feature and may be absent; CSF protein can be normal or only mildly elevated; MRI is a diagnostic imaging test, not a CSF finding.

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