" /> Transitory tyrosinaemia of newborn - CISMeF





ICD-11 code : KB63.4;

Preferred Label : Transitory tyrosinaemia of newborn;

ICD-11 definition : 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.;

ICD-11 synonym : transient neonatal hypertyrosinemia; transitory neonatal tyrosinemia; neonatal tyrosinemia;

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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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26/07/2025


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