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HelpTest Code IGGS4 IgG4, Immunoglobulin Subclasses, Serum
Reporting Name
IgG4, Ig SubclassesUseful For
Supporting the diagnosis of IgG4-related disease
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
SerumOrdering Guidance
This test only quantitates the IgG4 protein. If quantitation of all IgG subclass types is desired, order IGGS / IgG Subclasses, Serum.
Specimen Required
Patient Preparation: Fasting preferred but not required
Collection Container/Tube:
Preferred: Serum gel
Acceptable: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 1 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial.
Specimen Minimum Volume
0.5 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Ambient | 14 days | ||
| Frozen | 14 days |
Reference Values
0-<5 months: ≤19.8 mg/dL
5-<9 months: ≤20.8 mg/dL
9-<15 months: ≤22.0 mg/dL
15-<24 months: ≤23.0 mg/dL
2-<4 years: ≤49.1 mg/dL
4-<7 years: ≤81.9 mg/dL
7-<10 years: 1.0-108.7 mg/dL
10-<13 years: 1.0-121.9 mg/dL
13-<16 years: ≤121.7 mg/dL
16-<18 years: ≤111.0 mg/dL
≥18 years: 2.4-121.0 mg/dL
Day(s) Performed
Monday through Friday
CPT Code Information
82787
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| IGGS4 | IgG4, Ig Subclasses | 2469-5 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| IGGS4 | IgG4, Ig Subclasses | 2469-5 |
Interpretation
Elevated concentration of IgG4 is consistent with, but not diagnostic of, IgG4-related disease.
Report Available
1 to 2 daysReject Due To
| Gross hemolysis | Reject |
| Gross lipemia | Reject |
| Gross icterus | OK |
Method Name
Turbidimetry