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Stool Acidity Test

👤by MedicineNet.com 0 comments 🕔Monday, March 3rd, 2014

The stool acidity test is a test for diagnosing intolerance to lactose, the sugar contained in milk, in infants and very young children.

What is lactose intolerance?

Lactose intolerance is the inability to digest the lactose sugar in milk. Milk containing the sugar lactose is a main source of nutrition for infants and young children. With normal lactose tolerance, all of the lactose is digested (broken down into two smaller sugars) and absorbed in the small intestine so that none reaches the colon.

On the other hand, in individuals with lactose intolerance who lack the intestinal enzyme that breaks down the lactose, the ingested lactose is neither digested nor absorbed in the small intestine and reaches the colon where it is used by the bacteria in the colon. The bacteria produce chemicals that cause diarrhea and also produce gas. Some of the chemicals produced by bacteria include lactic and other acids that turn the stool acidic.

Individuals with intolerance to lactose cannot drink regular cow's milk without developing diarrhea, gas, and often abdominal pain. They instead must drink substitutes like rice or soy milk or treat cow's milk with an enzyme that digests the lactose (Lactaid) so that the smaller sugars can be absorbed in the small intestine.

Medically Reviewed by a Doctor on 3/3/2014

Medical Author:

Jay W. Marks, MD

Jay W. Marks, MD

Jay W. Marks, MD, is a board-certified internist and gastroenterologist. He graduated from Yale University School of Medicine and trained in internal medicine and gastroenterology at UCLA/Cedars-Sinai Medical Center in Los Angeles.

Medical Editor:

William C. Shiel Jr., MD, FACP, FACR

William C. Shiel Jr., MD, FACP, FACR

Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

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