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PKU Test – What Are The Normal Phe Levels?

For healthy individuals, the normal blood phenylalanine (Phe) level is usually around 1mg/dL. PKU patients, however, may have different Phe levels in their bodies, ranging from 6 – 30+ mg/dL.

Roughly, there are three groups of PKU disorder based on various Phe levels in person’s body:

1. Benign – type 3 (max. concentration of Phe <10 mg/dL)
2. Mild variation of classic PKU – type 2 (max. concentration of Phe 10-20 mg/dL)
3. Classic  – type 1 (max. concentration of Phe >20 mg/dL)

Want to learn more?


“The PKU Paradox: A Short History of a Genetic Disease” by Diane B. Paul and Jeffrey P. Brosco.

“Robert Guthrie–The Pku Story: Crusade Against Mental Retardation” by Jean Holt Koch.

“Low Protein Cookery for Phenylketonuria” by Virginia E. Schuett.

“Low Protein Food List for PKU” by Virginia E. Schuett.

“Low Protein Bread Machine Baking for PKU” by Virginia E. Schuett.

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