Is phenylketonuria false positive common?

Patient's question:

I don't know what's going on, but my child has been misbehaving and crying non-stop recently. Even the hospital check-ups haven't helped. Is phenylketonuria false positive common?

Doctor's answer:

Not much, further careful examination is needed for diagnosis. It is best to breastfeed these babies. The dosage of formula feeding is difficult to control, which may interfere with the baby's future intellectual development and personality formation. Language may also lag behind that of normal healthy children. After they grow a bit older, symptoms such as eczema, nausea, vomiting, and retching may recur. Therefore, it is essential to take the child to a regular hospital for a comprehensive examination and treatment for this disease.

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