Question

what test is used to identify lactase deficiency and blind loop syndrome?

Explanation:

Hydrogen breath test is used to identify lactase deficiency and blind loop syndrome. In lactase deficiency, undigested lactose reaches the colon where bacteria ferment it, producing hydrogen. In blind loop syndrome, bacterial overgrowth in the intestine leads to fermentation of nutrients (including carbohydrates) and hydrogen production. The hydrogen breath test measures the amount of hydrogen in exhaled breath after a test dose (e.g., lactose in lactase deficiency testing or a carbohydrate - containing solution in blind loop syndrome testing).

Answer:

Hydrogen breath test.