ARUP's Laboratory Test Directory

Immunoglobulin G Subclass 4 : 0050576

Mnemonic: IGG4

Methodology: Quantitative Nephelometry
Performed: Mon-Sat
Reported: 1-3 days
Specimen Required: Collect: Serum separator tube or green (sodium or lithium heparin).

Specimen Preparation: Separate serum or plasma from cells ASAP or within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.45 mL)

Storage/Transport Temperature: Refrigerated.

Stability (collection to initiation of testing): After separation from cells: Ambient: 2 hours; Refrigerated: 8 days; Frozen: 6 months
Reference Interval:
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: 7-89 mg/dL
3-4 years: 0-90 mg/dL
CPT Code(s): 82787
Cross References: IgG Subclass 4 (Immunoglobulin G Subclass 4)