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KB63.4 Transitory tyrosinaemia of newborn

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2024-01

Clinically asymptomatic elevated blood tyrosine level caused by late fetal maturation of 4-hydroxyphenylpyruvate dioxygenase, usually detected on newborn bloodspot screening. Most commonly seen in premature infants receiving milk formulae with high protein content. Generally considered benign and resolves by 4-6 weeks of age.

synonyms

• Transitory tyrosinaemia of newborn
• neonatal tyrosinemia
• transient neonatal hypertyrosinemia
• transitory neonatal tyrosinemia

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