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A 29-day-old infant was referred by the newborn screening laboratory with mild but persistent capillary thyroid stimulating hormone (TSH) elevation: 11 mU/l on day 5 of life and 19.5 mU/l on day 23. He was born in the 39th week by planned caesarean section weighing 3814 g and …
Competing interests None.
Patient consent Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.