Days Set Up
Tuesday, Friday
Analytic Time

8 hours

MiChart Code
IgG Index, CSF
Soft Order Code
GIN

Test Updated:

Synonyms

GI Index
GIN
GIN IgG
IgG Index
IgG Synthesis Rate
Index, IgG
Multiple Sclerosis (MS)
ALBS
IGG
ALCSF
IGCSF
ALBUMIN - SERUM
IMMUNOGLOBULIN G
IMMUNOGLOBULIN G-CSF
ALBUMIN-CSF
IGG INDEX RESULT

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Test Overview

Test Methodology

Nephelometry

Test Usage

Evaluation of blood-brain barrier integrity and detection of local CNS IgG synthesis.

Reference Range

CSF Albumin: 5-34 mg/dL; CSF IgG: 0-4.5 mg/dL; Serum Albumin (Adult): 3.5 - 4.9 g/dL; Serum IgG (Adult): 620-1520 mg/dL; IGG INDEX: 17-29 years: 0.32-0.60, 30-39 years: 0.34-0.59, 40-49 years: 0.36-0.56, 50-59 years: 0.33-0.57, 60-150 years: 0.34-0.58.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

Both blood and CSF samples must be obtained on the same day. Collect blood in SST tube. Centrifuge and aliquot serum into a plastic vial. Refrigerate serum and CSF.

Yellow Top Tube
Normal Volume
1.0 mL serum AND 1.0 mL CSF
Minimum Volume
0.5 mL serum AND 0.5 mL CSF

Billing Information

CPT Code
82784 x2, 82040, 82042
Pro Fee Code
 
LOINC
1746-7 (CSF ALB), 2464-6 (CSF IgG), 1751-7 (Ser ALB), 38488-3 (Ser IgG), 14117-6 (IgG Index)

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.