The mother asks the nurse why her newborn baby needs a blood test for phenylketonuria (PKU) before she could take her home. The nurse explains to the mother:
1. "It is because you have a family history of this disease."
2. "This test is done on in the U.S. on all babies who are 48 hours old."
3. "Your baby was overdue (42 weeks' gestation), and so has a greater chance of developing PKU."
4. "This is done because you have chosen to feed your baby formula, so she is not protected against PKU."
2
Rationale:
1. PKU testing is not done because of family history.
2. Neonatal screening for PKU is mandated by state law in all 50 states.
3. PKU does not occur from a longer-than-40-weeks gestation.
4. PKU does not occur because the newborn is formula-fed.
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