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Vanderbilt Pathology Laboratory Services

Test Directory



IGG INDEX - CSF (GIX)

Department: Core Lab
Test Synonym(s): GIX, Immunoglobulin G Index CSF
CPT Codes: 82040, 82042, 82784 (x2)
Reference Range: IgG CSF: 0.5 - 5.9 mg/dL, IgG serum: 694 - 1618 mg/dL, Albumin CSF: 13.9 - 24.6 mg/dL, Albumin serum: 3500 - 5000 mg/dL, Index: 0.28 - 0.66
Tube Type: LP tube and red top (no gel)
Specimen: CSF and blood
Alternate Specimen: None
Minimum Volume: CSF: 1 mL, Blood: 2 mL
Temperature: Refrigerate
Stability: Refrigerated: 24 hours
Reasons for Rejection: Contamination
Days Performed: Daily
Times Performed: Varies
TAT: 24-48 hours
Significance: If an oligoclonal immunoglobulin is requested also, the GIX will be performed as part of the oligoclonal panel and the GIX will be credited.
Special Instructions: This assay requires both serum and CSF. Serum should be collected within 5 days of CSF collection. Refrigerate upon collection.

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