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KB63.4Transitory tyrosinaemia of newborn
International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01
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.
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