Table 7: Sensitivity Analysis—Decreasing the sensitivity of the ¹³C UBT to 90.1%.

	Total		Incremental
Strategy	Cost ($)/Test	Misdiagnoses (FP +FN)	Cost ($)/Test	Misdiagnoses (FP +FN) Avoided	ICER $/Misdiagnoses Avoided
ELISA serology	$13.96	0.2236	Reference	Reference	Reference
13C UBTa	$74.96	0.0888	$61.00	0.1348	$452
ELISA serology + 13C UBT	$50.02	0.0662	$36.06	0.1574	$229

Abbreviations: ¹³C UBT, carbon-13 urea breath test; ELISA, enzyme-linked immunosorbent assay; FN, false-negative result; FP, false-positive result: ICER, incremental cost-effectiveness ratio.

^a13C UBT dominated by ELISA serology + ¹³C UBT (¹³C UBT more costly, fewer misdiagnoses avoided than ELISA + ¹³C UBT).