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IgE, Specific
| Item | Value | ||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Approval req'd? | No | ||||||||||||||||||||||||||
| Available Stat? | No | ||||||||||||||||||||||||||
| Test code | IGES, BTRAST | ||||||||||||||||||||||||||
| Performed by | Quest | ||||||||||||||||||||||||||
| Sendout? | Yes | ||||||||||||||||||||||||||
| Method | Pharmacia PCS system (successor to RAST testing) | ||||||||||||||||||||||||||
| Container type | Gold top | ||||||||||||||||||||||||||
| Amount to Collect | 1 mL blood per allergen | ||||||||||||||||||||||||||
| Sample type | Serum | ||||||||||||||||||||||||||
| Preferred volume | 0.5 mL serum per allergen | ||||||||||||||||||||||||||
| Min. Volume | 0.3 mL serum for one test | ||||||||||||||||||||||||||
| Processing notes | Refrigerate serum. Mark the appropriate Quest # from the test listing on the reference lab request slip, and order the proper Charge Group of the test in the laboratory computer.
Brown and Toland patient s require prior authorization. For B&T patients order "BTRAST" for each allergen. Refer to Labcorp test directory for correct test number. The free text result should include the name of the allergen, the level of specific IgE, the % binding, the "Class" and the interpretation. List of Available Allergens |
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| Units | KU/L and % | ||||||||||||||||||||||||||
| Normal range |
Note: LabCorp Reference range for B&T patrients < 0.08 KU/L |
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| Synonyms | RAST; PCS | ||||||||||||||||||||||||||
| Stability | Room temperature or refrigerated 2 weeks, frozen at -20C 1 month. | ||||||||||||||||||||||||||
| Turn around times | Test performed Monday-Friday. Turnaround time: 3-4 days. | ||||||||||||||||||||||||||
| Additional information | It is generally believed that reactivity of Class 2 or below is not an indication for immunotherapy. A NEGATIVE RESULT CAN OCCUR IN A SENSITIZED INDIVIDUAL WHO HAS NOT BEEN EXPOSED TO A PARTICULAR ANTIGEN FOR A PROLONGED PERIOD OF TIME, AND MAY ALSO OCCUR IN AN INDIVIDUAL WHO HAS VERY RECENTLY SUFFERED A SEVERE ALLERGIC REACTION. Due to the rise and fall of circulating antibodies to venoms and to penicillin G or V, specimens should be collected no sooner than 2-3 weeks and no later than 6 months after an insect sting or a penicillin exposure. See the list of antigens available for testing below, organized both alphabetically overall and by allergen type, e.g., foods, grasses, etc. Common inhalant allergens in Northern California are marked with a *. List of Available Allergens Tests must be ordered individually rather than in (more expensive) panels. Medicare/MediCal will not reimburse testing for specific IgE in a patient who has not previously demonstrated an elevation of total IgE. Brown & Toland patients require prior authorization for these tests. |
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| Last Updated | 7/24/2012 9:26:43 AM | ||||||||||||||||||||||||||
| Entry Number | 553 |
If you have additional questions regarding this test, please call: 415-353-1667