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.
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



Compliance Category

FDA

Note
Hotline History
N/A
CPT Codes

82787

Components
Component Test Code* Component Chart Name LOINC
0050576 Immunoglobulin G Subclass 4 2469-5
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Aliases
  • Class 4 IgG
  • Gamma-globulins 4
  • IgG class 4
  • IgG Subclass 4
Immunoglobulin G Subclass 4