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Test Code
IGG4
Test Name
IgG Subclass 4
CPT Codes
82787
Expected Turnaround Time
3 - 5 days
Clinical Utility
Useful for supporting the diagnosis of IgG4-related disease.
Specimen and Container Info

Preferred Specimen Type: Serum

Desired Specimen Volume: 2 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

IgG4 mg/dL

0 - 2 years

1 - 78

2 - 4 years

1 - 53

4 - 6 years

2 - 112

6 - 8 years

1 - 99

8 - 10 years

2 - 93

10 - 12 years

2 - 115

12 - 14 years

4 - 136

14 - 18 years

11 - 157

Adult

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.
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