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Phenylketonuria Dietary Management in Children

Lifelong dietary management of phenylalanine hydroxylase deficiency.

Written by: Saygı Hospital Health Guide Editorial Board
Last updated:

This content has been compiled by the Saygı Hospital Health Guide Editorial Board and is periodically reviewed by a specialist physician.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Çocuk Sağlığı ve Hastalıkları department. Book Appointment →

What is Phenylketonuria Dietary Management in Children?

Phenylketonuria (PKU) is an autosomal recessive amino acid metabolism disorder caused by a deficiency of the phenylalanine hydroxylase (PAH) enzyme. Untreated, accumulated phenylalanine causes severe neurological damage, mental retardation and seizures.

It is detected with newborn screening (heel prick) using the Guthrie test in many countries. After diagnosis a strict low-phenylalanine diet is started: phenylalanine-restricted formula, low-protein foods and amino acid mixtures.

Lifelong dietary management is critical. Recommended phenylalanine target levels: 120–360 µmol/L. Sapropterin (BH4) treatment may benefit responsive individuals. Strict dietary adherence is essential during pregnancy (maternal PKU syndrome).

Symptoms

Asymptomatic in newborn period (with screening)
Mental retardation (untreated)
Seizures
Microcephaly
Light skin and hair color
Behavioral disorders
Musty body odor

Risk Factors

PAH gene mutations
Autosomal recessive inheritance
Consanguineous parents
Family history
Carrier parents
Specific ethnic populations

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Positive newborn screening result
  • Mental retardation in untreated children
  • Persistent seizures
  • Family history of PKU
  • Maternal PKU pregnancy planning
  • Phenylalanine elevation

Treatment Methods

01
Strict low-phenylalanine diet
02
Phenylalanine-free amino acid formula
03
Low-protein foods
04
Sapropterin (BH4) — responsive PKU
05
Regular phenylalanine monitoring
06
Pregnancy planning and dietary control

Which Department to Visit?

You can visit our Çocuk Sağlığı ve Hastalıkları department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

Learn About Çocuk Sağlığı ve Hastalıkları Department

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.