Test Code: 41322
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.
| ||mcg/mL of IgG4 |
|Lower Limit of Quantitation ||0.15 |
|Upper Limit of Quantitation ||30.0 |
Reference ranges vary by allergen.
Setup: M-W-F. TAT: 2-3 business days from receipt of specimen.
-0.5 mL. Collect 1-2 mL whole blood in red top tube, centrifuge and transfer 0.5 mL serum into a transfer tube (Minimum Volume
). Ship at ambient or frozen temperature Monday through Friday. Specimens are stable for 1 week ambient, 4 weeks refrigerated; freeze for storage greater than 4 weeks.
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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-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.