When encountered with an over-abundance of amino acids, your body excretes it via urine. This can work in some cases, but only if there is a small amount. Anything above that "limit" has to be dissolved within the body. Thus, urinal discoloration is a classic sign of PKU. When taking your child to your MD, be sure to give the full slate about the condition. The treatment at first will be to drink a lot of water to see if the condition remains. After that, the doctor may suspect protein-based problems.

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