Scale
The RAST test is scored on a scale from 0 to 6:
| RAST rating | IgE level (KU/L) | comment |
|---|---|---|
| 0 | < 0.35 | ABSENT OR UNDETECTABLE ALLERGEN SPECIFIC IgE |
| 1 | 0.35 - 0.69 | LOW LEVEL OF ALLERGEN SPECIFIC IgE |
| 2 | 0.70 - 3.49 | MODERATE LEVEL OF ALLERGEN SPECIFIC IgE |
| 3 | 3.50 - 17.49 | HIGH LEVEL OF ALLERGEN SPECIFIC IgE |
| 4 | 17.50 - 49.99 | VERY HIGH LEVEL OF ALLERGEN SPECIFIC IgE |
| 5 | 50.0 - 100.00 | VERY HIGH LEVEL OF ALLERGEN SPECIFIC IgE |
| 6 | > 100.00 | EXTREMELY HIGH LEVEL OF ALLERGEN SPECIFIC IgE |
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—Henry David Thoreau (1817–1862)