Psabino, I don’t mean to be nosy, but can I ask why your friend thinks your nephew might have PKU? PKU is detected through the Newborn Screening. It is a heel prick and few drops of blood that is taken shortly after birth. In your nephew’s case it would probably be a finger poke and a few drops of blood on filter paper or a vein draw. You should probably begin by asking his family doctor. He or she should know what the Newborn Screening is, but if not then I am not sure where you would go next. A local Hospital maybe?