Johnson Grass (Sorghum halepense) IgG4
Test Code: 60322
Cpt Code:86001 (x1)
Clinical UtilityPhysicians sometimes use allergen-specific IgG4 to monitor patients undergoing immunotherapy. Increasing IgG4 responses following the administration of immunotherapy generally correlate with a positive treatment outcome.
ProcedureEnzyme immunoassay (FEIA). A standard curve is used to calculate the specific IgG concentrations. The calibrators are referenced to the International Reference Preparation for serum immunoglobulins. This test has not been cleared or approved for diagnostic use by the U.S. Food and Drug Administration.
|mcg/mL of IgG4|
|Lower Limit of Quantitation||0.15|
|Upper Limit of Quantitation||30.0|
Reference ranges vary by allergen.
Turnaround TimeSetup: M-W-F. TAT: 2-3 business days from receipt of specimen.
1 week ambient
4 weeks refrigerated
>4 weeks Frozen
Specimens are approved for testing in New York only when indicated in the Specimen Type and Specimen Handling field above.
The CPT codes provided are based on Viracor-IBT's interpretation of the American Medical Association's Current Procedural Terminology (CPT) codes and are provided for general informational purposes only. CPT coding is the sole responsibility of the billing party. Questions regarding coding should be addressed to your local Medicare carrier. Viracor-IBT assumes no responsibility for billing errors due to reliance on the CPT codes illustrated in this material.
Hamilton RG. Assessment of human allergic disease. In: Rich RR, Fleisher TA, Shearer WT, Kotzin BL and Schroeder HW (eds). Clinical Immunology, Principles & Practice, 2nd Ed., Chapter 124, Mosby, New York.