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General
Synonym/Acronym:
Allergen profile, radioallergosorbent test (RAST), ImmunoCAP Specific immunoglobulin E (IgE).
Common Use:
To assist in identifying environmental allergens responsible for causing allergic reactions.
Specimen:
Serum collected in a gold-, red-, or red/gray-top tube.
Normal Findings:
(Method: Radioimmunoassay or fluorescence enzyme immunoassay [FEIA])
| RAST Scoring Method (Radioimmunoassay) and ImmunoCAP Scoring Guide (FEIA) | Conventional and SI Units Allergen-Specific IgE |
|---|---|
| Specific IgE Allergen Antibody Level | kU/L |
| Absent or undetectable allergy | Less than 0.35 |
| Low allergy | 0.35–0.7 |
| Moderate allergy | 0.71–3.5 |
| High allergy | 3.51–17.5 |
| Very high allergy | 17.6–50 |
| Very high allergy | 51–100 |
| Very high allergy | Greater than 100 |
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