Laboratory Services
Immunoglobulin, IgG
Print this pageUpdated Test Information:
| Test Description |
Immunoglobulin, IgG
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|---|---|---|
| Synonym(s) |
IgG Immunoglobulin
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| Test ID |
IGG
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| General Information |
Approximately 80% of serum immunoglobulin is IgG. Its main tasks are the defense against microorganisms, direct nertralization of toxins, and induction of complement fixation. IgG is the only immunoglobulin that can cross the placental barrier and provide passive immune protection for the fetus and newborn until the infant's immune system starts to develop at about six months of age. Near-adult levels in serum/plasma are reached at about 18 months.
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| Specimen Type |
Serum
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| Specimen Requirements |
SST
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| Alternate Specimen Type |
Red, Li-heparin plasma, K2EDTA
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| Specimen Collection / Processing Instructions |
SST - Separate serum or plasma from cells within 45 minutes of collection. If a red-top tube or green-top tube is used, transfer separated serum or plasma to a plastic transport tube.
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| Minimum Sample Volume |
1 mL
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| Pediatric Min. Volume (if applicable) |
500 uL
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| Additional Processing Details |
Separate serum or plasma from cells within 45 minutes of collection. If a red-top tube or green-top tube is used, transfer separated serum or plasma to a plastic transport tube.
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| Stability |
4 months at 15‑25 °C
8 months at 2‑8 °C 8 months at (-15)‑(-25) °C |
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| Limitations |
This test may not provide accurate results in patients with monoclonal gammopathy, due to individual sample characteristics which can be assessed by electrophoresis.
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| Methodology |
Immunoturbidimetric
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| Estimated TAT |
0-2 days
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| Testing Schedule |
Monday-Saturday
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| CPT Code(s) |
82784
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| Reference Range |
Adults: 700-1600 mg/dL
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| Performing Lab |
Incyte Diagnostics
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| LOINC Code(s) |
2465-3
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