Modified acid reflux test. A benefit and cost analysis.

Although the standard acid reflux test is often used to diagnose gastroesophageal reflux (GER), the cost and benefit of this diagnostic test has never been evaluated. In this study, 184 consecutive referrals with esophageal symptoms were interviewed and had an esophagram, an esophageal manometry, and a modified acid reflux test (MART). The results were analyzed to determine how frequently MART altered the clinical diagnosis and to assess the cost of the new information. Patients with typical symptoms of GER (heartburn or regurgitation) were compared to those with atypical presentation (chest pain or dysphagia). Previously unsuspected GER was demonstrated in 63% of the atypical group, whereas no altered diagnosis was made in the typical group. There was no statistically significant difference between the two groups when mean lower esophageal sphincter pressures and mean pH scores were compared. MART was cost effective only in the atypical group, in which the cost of an altered diagnosis was $633.00.