NEW YORK, NY (July 6, 2011) - 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.
"Celiac disease can affect the small intestine in a patchy distribution, and so just one or two biopsy samples could potentially miss the evidence of the disease," said lead author Benjamin Lebwohl, MD, MS, a gastroenterologist at the Celiac Disease Center at Columbia University Medical Center, in New York. Dr. Lebwohl and co-authors aimed to measure the practice of small intestinal biopsy in the United States. The Caris pathology database consists of specimens submitted by gastroenterologists from 43 states as well as Puerto Rico and the District of Columbia. The team also compared the diagnosis rate among patients who had at least four specimens submitted, in accordance with guidelines.
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.
Reference: Lebwohl B, Kapel RC, Neugut AI, Green PH, Genta RM. Adherence to biopsy guidelines increases celiac disease diagnosis. Gastrointestinal Endoscopy, July 2011.
B L, RK, AN and PG have no financial or other conflicts of interest to declare. RG is employed by Caris Life Sciences.
Columbia University Medical Center provides international leadership in basic, pre-clinical and clinical research, in medical and health sciences education, and in patient care. The medical center trains future leaders and includes the dedicated work of many physicians, scientists, public health professionals, dentists, and nurses at the College of Physicians and Surgeons, the Mailman School of Public Health, the College of Dental Medicine, the School of Nursing, the biomedical departments of the Graduate School of Arts and Sciences, and allied research centers and institutions. Established in 1767, Columbia's College of Physicians and Surgeons was the first institution in the country to grant the M.D. degree and is among the most selective medical schools in the country. Columbia University Medical Center is home to the largest medical research enterprise in New York City and State and one of the largest in the United States.
Celiac Disease Center at Columbia University provides comprehensive medical care for adults and pediatric patients with celiac disease, including nutrition and attention to the multiple associated conditions that occur in celiac disease. The Center is involved in the care of thousands of patients with celiac disease and gluten intolerance, providing better access to proper testing, diagnosis, treatment and follow-up care. Additional information is available online at www.celiacdiseasecenter.org.