Immunoglobulin G (IgG)

Cleveland Heartlab I, Test


CPT Code: 82784
Order Code: 543
ABN Requirement:
Specimen: Serum
Volume:  2.0 mL
Minimum Volume:  0.5 mL
Container: Gel-barrier tube (SST)


  1. Collect and label sample according to standard protocols.
  2. Gently invert tube 5 times immediately after draw. Do not shake.
  3. Allow blood to clot 30 minutes.
  4. Centrifuge for 10 minutes.

Transport: Store serum at 2°C to 8°C after collection and ship the same day per packaging instructions included with the provided shipping box.


Ambient (15-25°C): 72 hours
Refrigerated (2-8°C):
7 days
Frozen (-20°C):
90 days

Causes for Rejection: Specimens other than serum; improper labeling; samples not stored properly; samples older than stability limits; gross hemolysis; gross lipemia

Methodology: Immunoturbidimetric

Turn Around Time:  2 to 3 days

Reference Range:

1-28 days250-600
1-3 months200-600
4-6 months160-590
7-11 months160-800
1 year280-1040
2 years330-1120
3-5 years390-1360
6-8 years440-1470
9-11 years480-1530
12-16 years500-1590
17-60 years600-1640
≥61 Years600-1540

Clinical Significance: Increased IgG is associated with acute and chronic inflammations, monoclonal IgG myeloma, autoimmune diseases; decreased IgG is found in selective IgG deficiency, Bruton’s Disease, and acquired immune deficiency.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.