REDUCING SUBSTANCE, STOOL

What this test checks

Tests stool for sugars that shouldn't be there — a sign the gut isn't absorbing sugars properly.

Why do people get this test?

Common test in infants with chronic diarrhea or suspected lactose intolerance.

When you should consider this test

• Infant with chronic diarrhea
• Suspected lactose intolerance
• Failure to gain weight in children

How to prepare

Fresh stool sample needed.