IMMUNOGLOBULIN G (IgG), SUBCLASS 4

Test Documentation
Specimen Required
Draw blood in a SST. Centrifuge, separate and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Red-top

Methodology
Nephelometry

Stability
Room Temperature: Unacceptable; Refrigerated: 8 days; Frozen: 3 months

Reference Range
0-1 month:   4-55 mg/dL  
1-4 months:   <3-36 mg/dL  
4-6 months:   <3-23 mg/dL  
6-12 months:   <3-43 mg/dL  
1-1.5 months:   <3-62 mg/dL  
1.5-2 years:   <3-79 mg/dL  
2-3 years:   <3-106 mg/dL  
3-4 years:   <3-127 mg/dL  
4-6 years:   <3-158 mg/dL  
6-9 years:   <3-189 mg/dL  
9-12 years:   3-210 mg/dL  
12-18 years:   4-230 mg/dL  
18-150 years:   3-201 mg/dL  

Performed
Monday-Friday

Turnaround Time2-3 days
Test CodeIGG4
CPT-4 Code (s)
82787
LOINC Codes
2469-5

Warde
Medical
Laboratory