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Immunoglobulin G Subclass 4
0050576
Ordering Recommendation

Aid in diagnosis of immunodeficiencies. Secondary test in suspected immunoglobulin deficiency. Do not order before IgG, IgA, and IgM measurements are performed. 

Mnemonic
IGG4
Methodology
Quantitative Nephelometry
Performed
Mon-Sat
Reported
1-3 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
 
Collect
Serum separator tube. 
Specimen Preparation
Separate serum from cells ASAP or within 2 hours of collection. Transfer 1 mL serum to an ARUP Standard Transport Tube. (Min: 0.45 mL) 
Storage/Transport Temperature
Refrigerated. 
Unacceptable Conditions
 
Remarks
 
Stability
After separation from cells: Ambient: 2 hours; Refrigerated: 8 days; Frozen: 6 months 
Reference Interval
Effective February 16, 2016
Cord blood: 1-47 mg/dL                         5-6 years: 2-116 mg/dL
0-2 months: 1-33 mg/dL                         7-8 years: 0-138 mg/dL
3-5 months: 1-14 mg/dL                         9-10 years: 1-95 mg/dL
6-8 months: 1-16 mg/dL                         11-12 years: 1-153 mg/dL
9-23 months: 1-65 mg/dL                       13-14 years: 2-143 mg/dL
2 years: 0-120 mg/dL                              15 years and older: 1-123 mg/dL
3-4 years: 0-90 mg/dL
Interpretive Data


Note
Hotline History
View Hotline History
Components
Component Test Code*Component Chart NameLOINC
0050576Immunoglobulin G Subclass 42469-5
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Aliases
  • Class 4 IgG
  • Gamma-globulins 4
  • IgG class 4
  • IgG Subclass 4