IgG Index and Synthesis Rate

CPT: 82040; 82042; 82784(x2)
Print Share

Expected Turnaround Time

3 - 5 days


Related Documents


Specimen Requirements


Specimen

Serum and cerebrospinal fluid (CSF)


Volume

1.5 mL serum and 1 mL CSF


Minimum Volume

0.7 mL serum and 0.5 mL CSF


Container

Red-top tube or gel-barrier tube and sterile container for CSF


Storage Instructions

Room temperature


Stability Requirements

Temperature

Period

Room temperature

14 days

Refrigerated

14 days

Frozen

6 months

Freeze/thaw cycles

Stable x2


Test Details


Limitations

Conditions in which lymphoreticular elements of the CNS produce immunoglobulins will result in false-positive (in relation to multiple sclerosis) elevations. Such conditions include (but are not limited to) aseptic meningitis, lymphoma, neurosyphilis, Guillain-Barré syndrome, and cerebral lupus erythematosus. These conditions, however, are either uncommon or are not frequently associated with an increased IgG index.


Methodology

CSF IgG, CSF albumin and serum IgG: Immunologic; serum albumin: spectrophotometry; ratio, index and synthesis rate by calculation


LOINC® Map

Order Code Order Code Name Order Loinc Result Code Result Code Name UofM Result LOINC
203836 IgG Index+Synthesis Rate 012212 IgG, Quant, CSF mg/dL 2464-6
203836 IgG Index+Synthesis Rate 012230 Albumin, CSF mg/dL 1746-7
203836 IgG Index+Synthesis Rate 001776 Immunoglobulin G, Qn, Serum mg/dL 2465-3
203836 IgG Index+Synthesis Rate 001081 Albumin g/dL 1751-7
203836 IgG Index+Synthesis Rate 160311 IgG/Alb Ratio, CSF 2470-3
203836 IgG Index+Synthesis Rate 101124 CSF IgG Index 14117-6
203836 IgG Index+Synthesis Rate 085937 IgG, Syn Rate,CSF mg/day 14116-8
203836 IgG Index+Synthesis Rate 120173 CSF/Serum Alb. Index 1756-6

For Providers

Please login to order a test

Order a Test

© 2021 Laboratory Corporation of America® Holdings and Lexi-Comp Inc. All Rights Reserved.

CPT Statement/Profile Statement

The LOINC® codes are copyright © 1994-2021, Regenstrief Institute, Inc. and the Logical Observation Identifiers Names and Codes (LOINC) Committee. Permission is granted in perpetuity, without payment of license fees or royalties, to use, copy, or distribute the LOINC® codes for any commercial or non-commercial purpose, subject to the terms under the license agreement found at https://loinc.org/license/. Additional information regarding LOINC® codes can be found at LOINC.org, including the LOINC Manual, which can be downloaded at LOINC.org/downloads/files/LOINCManual.pdf