Transient hypothyroxinaemia

Description

Transient hypothyroxinaemia is characterised by low thyroxine (T4, T3 and FT4) levels but normal level of thyroid-stimulating hormone (TSH), and is seen in preterm infants, usually those born before 30 weeks of gestational age.

Coding note from above levels

Conditions arising in the perinatal period, even though death or morbidity occurs later, should, as far as possible, be coded to chapter 19, which takes precedence over chapters containing codes for diseases by their anatomical site. For children less than 28 days old, assume that a reported condition developed in the perinatal period, unless the duration is stated and the onset was after the first completed week of life.

Exclusions from above levels

• 5A00.0 – Congenital hypothyroidism
• 5A00.00 – dyshormogenetic goitre
• 5A00.02 – Pendred syndrome