July 7, 2011
Low Adherence To Biopsy Guidelines Affects Celiac Disease Diagnosis In The United States
A new study has found that most patients undergoing biopsy of the small intestine do not have the recommended number of samples to diagnose celiac disease. The study, published in the July 2011 issue of Gastrointestinal Endoscopy, analyzed a national database of biopsy specimens maintained by Caris Life Sciences (Irving, TX). More than 100,000 patients had a biopsy of the small intestine, but only 35 percent of them had at least four samples taken, the number recommended by professional guidelines.
Celiac disease is common, affecting approximately 1 percent of the population in the United States. However, the vast majority of patients with celiac disease in the United States have not been diagnosed. Many of these patients seek health care for symptoms including diarrhea, weight loss, or fatigue due to anemia. The diagnosis of celiac disease is made by biopsy of the small intestine, but factors related to the performance of biopsy may contribute to the under-diagnosis of celiac disease in the United States.
The investigators identified 132,352 individuals who underwent biopsy between 2006 and 2009, for a variety of medical indications, including diarrhea, abdominal pain, esophageal reflux, and anemia. Only 35 percent of this group had at least four specimens submitted, and the most common number of specimens submitted was two. But adhering to the recommendation of submitting at least four specimens more than doubled the diagnosis rate of celiac disease.
Even when physicians indicated that they were suspicious of celiac disease (e.g., when patients had positive celiac disease blood tests), fewer than 40 percent of patients had at least four specimens submitted; the diagnosis was increased sevenfold when the guidelines were followed.
"The process of increasing the number of specimens from two to four takes approximately one extra minute during endoscopy," said Dr. Lebwohl. Given the high incremental yield of submitting at least four specimens, taking this extra minute appears to be justified.
"In this study we identified just one of the factors contributing to the high rate of under-diagnosis of celiac disease in the United States. We plan on studying other physician-related factors that may also be operative," said Dr. Peter Green, Director of the Celiac Center Columbia University Medical Center, who was also an author on the paper.
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