The nursing instructor asks a nursing student about phenylketonuria (PKU). Which statement made by the student indicates a need for further teaching? 1. “PKU is an autosomal-recessive disorder.” 2....

The nursing instructor asks a nursing student about phenylketonuria (PKU). Which statement made by the student indicates a need for further teaching?

1. “PKU is an autosomal-recessive disorder.” 2. “PKU primarily affects the gastrointestinal system.” 3. “Treatment of PKU includes the dietary restriction of phenylalanine.” 4. “All 50 states require routine screening of all newborns for PKU.”