Table 3.

Sensitivity of each test modality in the 25 patients with at least two positive chlorhexidine tests

	SPT	sIgE	IDT	BAT
True positives	9	17	17	3
False negatives	16	8	2	3
Sensitivity in cases with at least three tests (95% CI)	36%* (17–55%)	68% (50–86%)	89% (75–100%)	50% (10–90%)
Published sensitivity [7]	95%	100%	68%	Not published

*The majority of cases were diagnosed on the basis of skin prick test (SPT) or specific immunoglobulin (sIg)E and this subgroup represents cases where multiple tests were used, predominantly because the initial screening test was negative. IDT = intradermal skin test; BAT = basophil activation test; CI = confidence interval.