Test Directory

Clear All
Test Code
IGGS
Test Name
Immunoglobulin IgG Subclasses
CPT Codes
82787 X 4
Included Tests
  • IgG Subclass 1
  • IgG Subclass 2
  • IgG Subclass 3
  • IgG Subclass 4
Expected Turnaround Time
3 - 5 days
Clinical Utility
Used to assess humoral immunity. Immunoglobulin G (IgG) is the most abundant immunoglobulin of extravascular liquids (65%) and of serum (70-75%). Antibodies of the IgG class are produced in response to most bacteria and viruses.
Specimen and Container Info

Preferred Specimen Type: Serum

Desired Specimen Volume: 3 mL

Preferred Collection Container: Gold Top, Serum Separator
Processing and Submission Instructions

Separator tubes: Contains clot activator and gel for separating serum from cells, but not anticoagulant. Separate serum from cells as soon as the clot has formed (30 minutes). If specimen is centrifuged before clotting is complete, a fibrin clot will form on top of the cell. This may cause the gel barrier to not be intact and could cause improper separation of serum and cells, possibly affecting test results.
Transport Instructions

Transport refrigerated.
Stability Requirements

Refrigerated

7 days

Frozen

<20°C for long-term storage.   

Freeze/Thaw Cycles

Avoid multiple freeze/thaw cycles.
Methodology
Turbidimetric
Reference Intervals

Age

IgG1 mg/dL

IgG2 mg/dL

IgG3 mg/dL

IgG4 mg/dL

0 - 2 years

194 - 842

23 - 300

19 -85

1 - 78

2 - 4 years

315 - 945

36 - 225

18 - 67

1 - 53

4 - 6 years

306 - 945

61 - 345

10 - 122

2 - 112

6 - 8 years

288 - 918

44 - 375

16 - 85

1 - 99

8 - 10 years

432 - 1020

72 - 430

13 - 85

2 - 93

10 -12 years

423 -1060

76 - 355

18 - 173

2 - 115

12 -14 years

342 - 1150

100 - 455

29 - 125

4 - 136

14 - 18 years

315 - 855

64 - 495

23 - 196

11 - 157

Adult

382 - 928

242 - 700

22 - 176

4 - 86
Performing Location
Roble Road Core Laboratory
Testing Schedule
Routine, 2 - 3 times per week
The American Medical Association (AMA) Current Procedural Terminology (CPT) codes published by HNL Lab Medicine are guidelines and are intended for informational purposes only. CPT coding is the exclusive responsibility of the billing entity. View the Terms.
© 2026 HNL Lab Medicine. All rights reserved.