Reading the cut-off line
Ruling out — value below this, high-sensitivity threshold, makes true allergy unlikely.
Optimal (EAACI) — the balanced cut-off recommended by the European Academy of Allergy & Clinical Immunology.
Ruling in — value above this, high-specificity threshold, makes true allergy likely.
Diagnostic accuracy tiers, by specificity or sensitivity:
High ≥ 90% · Moderate 75–89% · Low < 75%
High ≥ 90% · Moderate 75–89% · Low < 75%