Test Directory

Immunoglobulin, IgG

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Updated Test Information:

Test Description
Immunoglobulin, IgG
Synonym(s)
IgG Immunoglobulin
Test ID
IGG
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.
Specimen Type
Serum
Alternate Specimen Type
Red, Li-heparin plasma, K2EDTA
Specimen Requirements
SST
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.
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.
Stability
4 months at 15‑25 °C
8 months at 2‑8 °C
8 months at (-15)‑(-25) °C
Limitations
This test may not provide accurate results in patients with monoclonal gammopathy, due to individual sample characteristics which can be assessed by electrophoresis.
Methodology
Immunoturbidimetric
Estimated TAT
0-2 days
Testing Schedule
Monday-Saturday
CPT Code(s)
82784
Minimum Sample Volume
1 mL
Pediatric Min. Volume (if applicable)
500 uL
Reference Range
Adults: 700-1600 mg/dL
Performing Lab
Incyte Diagnostics
LOINC Code(s)
2465-3