Abstract
Summary
1. The excretion of phenylpyruvic acid by patients with phenylketonuria is roughly proportional to their fasting serum phenylalanine levels. Phenylpyruvic acid is not detectable in urine of patients with serum levels below 15 mg% phenylalanine. 2. Children less than 3 years old frequently show much higher serum levels of phenylalanine than older patients. 3. The incidence of known phenylketonuria in Utah during the past 10 years has been 1 in 20,400 births.
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