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Test ID CASF IgG/Albumin Ratio, Spinal Fluid

Useful For

The cerebrospinal fluid (CSF) index is useful in the diagnosis of individuals with multiple sclerosis. In the absence of a paired CSF and serum specimen, the CSF IgG/albumin ratio can be assessed.

 

The index is independent of the activity of the demyelinating process.

Method Name

Nephelometry

Reporting Name

IgG/Albumin Ratio, CSF

Specimen Type

CSF

Specimen Required

Collection Container/Tube: Sterile vial

Collection Container/Tube: Plastic vial

Specimen Volume: 1 mL

Forms: If not ordering electronically, complete, print, and send a Neurology Test Request Form (T732) with the specimen (http://www.mayomedicallaboratories.com/it-mmfiles/neurology-request-form.pdf)

Specimen Minimum Volume

0.5 mL

Specimen Stability Information

Specimen Type Temperature Time
CSF Refrigerated (preferred) 14 days
  Ambient  14 days
  Frozen  14 days

Reference Values

CSF IgG: 0.0-8.1 mg/dL

CSF albumin: 0.0-27.0 mg/dL

CSF IgG/albumin: 0.00-0.21

Day(s) and Time(s) Performed

Monday through Saturday; 2 p.m.

Performing Laboratory

Mayo Medical Laboratories in Rochester

CPT Code Information

82042-Albumin

82784-IgG

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CASF IgG/Albumin Ratio, CSF 2470-3

 

Result ID Test Result Name Result LOINC Value
IGG_C IgG, CSF 2464-6
ALB_C Albumin, CSF 1746-7
AIGAC IgG/Albumin, CSF 2470-3

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.