Which term refers to the relative lactase deficiency observed in preterm infants of less than 34 weeks of gestation?
a. Congenital lactase deficiency
b. Primary lactase deficiency
c. Secondary lactase deficiency
d. Developmental lactase deficiency
ANS: D
Developmental lactase deficiency refers to the relative lactase deficiency observed in preterm infants of less than 34 weeks of gestation. Congenital lactase deficiency occurs soon after birth after the newborn has consumed lactose-containing milk. Primary lactase deficiency, sometimes referred to as late-onset lactase deficiency, is the most common type of lactose intolerance and is manifested usually after 4 or 5 years of age. Secondary lactase deficiency may occur secondary to damage of the intestinal lumen, which decreases or destroys the enzyme lactase.
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