The clinical utility of food-specific IgG4 tests has not been clearly established. Physicians sometimes use allergen-specific IgG4 to evaluate patients prior to or during immunotherapy. These tests can be used in special clinical situations. This test should only be ordered by physicians who recognize the limitations of the test.
Enzyme 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.
2-3 business days from receipt of specimen
|Specimen Type||Order Code||CPT Code||NY Approved||Volume||Assay Range||Special Instructions|
|Serum||57222||86001||No||0.5 mL (min. 150 uL)||See Limit of Quantitation Guide||
|mcg/mL of IgG4|
|Lower Limit of Quantitation||0.15|
|Upper Limit of Quantitation||30.0|
Reference ranges vary by allergen.
Specimens are approved for testing in New York only when indicated in the Specimen Information field above.
The CPT codes provided are based on Viracor Eurofins' 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 Eurofins 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.