A nurse is reinforcing teaching about phenylketonuria (PKU) testing with the parent of a newborn. Which of the following statements by the parent indicates a need for further teaching?

D Sometimes the test is repeated in the doctor's office at the 2-week check-up. C This test checks for a genetic disorder that can be corrected by diet. A My baby will be placed under special lights if the test is elevated. B My baby must take formula or breast milk before the test is done.