How can my daughter have Phenylketonuria if we don't have it?

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How Can My Daughter Have Phenylketonuria If We Don't Have It?

My daughter's pediatrician says that she has Phenylketonuria. She said that it is a hereditary metabolic disorder and is easily treatable. I don't understand how it can be hereditary if neither my wife or I have it. How can something be hereditary if neither parent has the disorder?