Cost-effectiveness analysis of strategies for diagnosing celiac disease.

Published

Journal Article

OBJECTIVE: To compare strategies for diagnosing celiac disease (CD). METHODS: A decision analytic model was used to compare five strategies on diagnostic performance and costs. RESULTS: First, tTG screening alone is the least costly strategy ($22/individual). While the NPV is high (99.8%), the PPV is low (63.4%). Second, if tTG-positive patients undergo esophagogastroduodenoscopy (EGD) to confirm CD, the PPV increases to 100% ($2,237/false-positive diagnosis avoided). Third, if EGDs are restricted to only those who are both tTG and HLA DQ2/8 positive, costs are slightly reduced ($59 vs. $63/individual), while PPV and NPV remain unchanged. Fourth, screening tTG-negative patients for IgA deficiency increases the NPV to 99.9% ($32,605/false-negative diagnosis avoided). Sensitivity analyses revealed that as the prevalence of CD increases, the cost of avoiding a false-positive diagnosis by adding EGD to the tTG alone strategy increases considerably. CONCLUSIONS: When the pre-test probability of CD is low, patients with positive tTG serology should undergo EGD with biopsy-either directly or after positive screening for HLA DQ2/8-to confirm CD. As the pre-test probability of CD increases, the added cost of EGD should be weighed against the consequences of a false-positive diagnosis. Routinely screening for IgA deficiency in order to avoid a false-negative diagnosis is quite costly.

Full Text

Duke Authors

Cited Authors

  • Dorn, SD; Matchar, DB

Published Date

  • March 2008

Published In

Volume / Issue

  • 53 / 3

Start / End Page

  • 680 - 688

PubMed ID

  • 17934849

Pubmed Central ID

  • 17934849

International Standard Serial Number (ISSN)

  • 0163-2116

Digital Object Identifier (DOI)

  • 10.1007/s10620-007-9939-5

Language

  • eng

Conference Location

  • United States