Which newborn screening test is required by all states and is performed 24-48 hours after birth and after the infant has ingested proteins?

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PKU (Phenylketonuria) screening is required by all states to be performed on newborns 24-48 hours after birth and after the infant has ingested proteins. This is to detect the rare inherited disorder that increases the levels of a substance called phenylalanine in the blood, which can lead to intellectual disabilities if not treated.

Which Newborn Screening Test Is Required by All States and Is