Test Directory

Test Code
IGG
Test Name
Immunoglobulin G
CPT Codes
82784
Expected Turnaround Time
1 - 3 days
Clinical Utility
Used to assess humoral immunity. Immunoglobulin G is the most abundant class of immunoglobulin and is produced in response to most bacteria and viruses.
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

IgG mg/dL

0 - 14 days

320 - 1407

15 days - 1 year

108 - 702

1 - 4 years

316 - 1148

4 - 10 years

542 - 1358

10 - 19 years

658 - 1534

Adult

680 - 1445

Performing Location
Roble Road Core Laboratory
Testing Schedule
Routine, 6 times per week