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Skin prick test (SPT) and f340 sensitivity and specificity in patients with carmine allergy
| Variable | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|
| SPT | 56 | 63 | 36 | 79 |
| f340 | 78 | 40 | 37 | 80 |
SPT – skin prick test, f340 – specific IgE for cochineal extract (carmine red), Phadia; PPV – positive predictive value, NPV – negative predictive value.
