A nurse is providing teaching to the parents of a newborn about newborn genetic screening. Which of the following statements should the nurse include in the teaching?

Newborn metabolic screening (PKU and other tests) is performed after 24 hours of age and after the newborn has fed, because some metabolic disorders cannot be detected until the newborn has ingested protein. No fluid preparation is needed prior to the test. The test is done by heel stick (not venipuncture from the inner elbow). While some facilities recommend a repeat screen at 1–2 weeks of age, the routine repeat at 2 months is not standard practice.