Redtop/Bent Grass (Agrostis stolonifera) IgG4
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||60822||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.