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A comparison between lactose breath test and quick test on duodenal biopsies for diagnosing lactase deficiency in patients with self-reported lactose intolerance.
J Clin Gastroenterol. 2013 Feb; 47(2):148-52.JC

Abstract

BACKGROUND

A lactose breath test (LBT) is usually used to diagnose lactase deficiency, and a lactose quick test (LQT) has been proposed as a new test on duodenal biopsies to detect this disorder.

GOALS

We aimed to assess the diagnostic accuracy of LBT and LQT and their ability to predict the clinical response to a lactose-free diet in patients with self-reported lactose intolerance.

STUDY

Fifty-five patients (age 47 ± 14 y; M/F 15/36) underwent upper gastrointestinal endoscopy and 25g-LBT. Two duodenal biopsies were taken to determine lactase deficiency (normal, mild, or severe) by LQT and to rule out other causes of secondary lactose malabsorption. Patients with a positive LBT and normal LQT also underwent a glucose breath test to exclude small intestinal bacterial overgrowth as a cause of the former result. The severity of gastrointestinal symptoms was measured with a GSS questionnaire, under basal condition and 1 month after a lactose-free diet.

RESULTS

Lactose malabsorption was detected in 31/51 patients with LBT and in 37/51 patients with LQT (P = NS). Celiac disease was found in 2 patients. Two LBT+ patients showed a positive glucose breath test for small intestinal bacterial overgrowth. Eight patients had a mild hypolactasia by LQT and a negative LBT, but they had a significant improvement of symptoms after diet. LQT and LBT were concordant in 83% of cases and predicted the response to a lactose-free diet in 98% and 81% of the cases, respectively (P = 0.03).

CONCLUSIONS

LQT is as sensitive as LBT in detecting lactase deficiency; however, it seems to be more accurate than LBT in predicting the clinical response to a lactose-free diet.

Authors+Show Affiliations

Department of Internal Medicine, Gatroenterology Unit, University of Genoa, Genoa, Italy.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article

Language

eng

PubMed ID

22495813

Citation

Furnari, Manuele, et al. "A Comparison Between Lactose Breath Test and Quick Test On Duodenal Biopsies for Diagnosing Lactase Deficiency in Patients With Self-reported Lactose Intolerance." Journal of Clinical Gastroenterology, vol. 47, no. 2, 2013, pp. 148-52.
Furnari M, Bonfanti D, Parodi A, et al. A comparison between lactose breath test and quick test on duodenal biopsies for diagnosing lactase deficiency in patients with self-reported lactose intolerance. J Clin Gastroenterol. 2013;47(2):148-52.
Furnari, M., Bonfanti, D., Parodi, A., Franzè, J., Savarino, E., Bruzzone, L., Moscatelli, A., Di Mario, F., Dulbecco, P., & Savarino, V. (2013). A comparison between lactose breath test and quick test on duodenal biopsies for diagnosing lactase deficiency in patients with self-reported lactose intolerance. Journal of Clinical Gastroenterology, 47(2), 148-52. https://doi.org/10.1097/MCG.0b013e31824e9132
Furnari M, et al. A Comparison Between Lactose Breath Test and Quick Test On Duodenal Biopsies for Diagnosing Lactase Deficiency in Patients With Self-reported Lactose Intolerance. J Clin Gastroenterol. 2013;47(2):148-52. PubMed PMID: 22495813.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparison between lactose breath test and quick test on duodenal biopsies for diagnosing lactase deficiency in patients with self-reported lactose intolerance. AU - Furnari,Manuele, AU - Bonfanti,Daria, AU - Parodi,Andrea, AU - Franzè,Jolanda, AU - Savarino,Edoardo, AU - Bruzzone,Luca, AU - Moscatelli,Alessandro, AU - Di Mario,Francesco, AU - Dulbecco,Pietro, AU - Savarino,Vincenzo, PY - 2012/4/13/entrez PY - 2012/4/13/pubmed PY - 2013/7/3/medline SP - 148 EP - 52 JF - Journal of clinical gastroenterology JO - J. Clin. Gastroenterol. VL - 47 IS - 2 N2 - BACKGROUND: A lactose breath test (LBT) is usually used to diagnose lactase deficiency, and a lactose quick test (LQT) has been proposed as a new test on duodenal biopsies to detect this disorder. GOALS: We aimed to assess the diagnostic accuracy of LBT and LQT and their ability to predict the clinical response to a lactose-free diet in patients with self-reported lactose intolerance. STUDY: Fifty-five patients (age 47 ± 14 y; M/F 15/36) underwent upper gastrointestinal endoscopy and 25g-LBT. Two duodenal biopsies were taken to determine lactase deficiency (normal, mild, or severe) by LQT and to rule out other causes of secondary lactose malabsorption. Patients with a positive LBT and normal LQT also underwent a glucose breath test to exclude small intestinal bacterial overgrowth as a cause of the former result. The severity of gastrointestinal symptoms was measured with a GSS questionnaire, under basal condition and 1 month after a lactose-free diet. RESULTS: Lactose malabsorption was detected in 31/51 patients with LBT and in 37/51 patients with LQT (P = NS). Celiac disease was found in 2 patients. Two LBT+ patients showed a positive glucose breath test for small intestinal bacterial overgrowth. Eight patients had a mild hypolactasia by LQT and a negative LBT, but they had a significant improvement of symptoms after diet. LQT and LBT were concordant in 83% of cases and predicted the response to a lactose-free diet in 98% and 81% of the cases, respectively (P = 0.03). CONCLUSIONS: LQT is as sensitive as LBT in detecting lactase deficiency; however, it seems to be more accurate than LBT in predicting the clinical response to a lactose-free diet. SN - 1539-2031 UR - https://www.unboundmedicine.com/medline/citation/22495813/A_comparison_between_lactose_breath_test_and_quick_test_on_duodenal_biopsies_for_diagnosing_lactase_deficiency_in_patients_with_self_reported_lactose_intolerance_ L2 - http://dx.doi.org/10.1097/MCG.0b013e31824e9132 DB - PRIME DP - Unbound Medicine ER -