What are the causes of elevated TSH in a newborn?
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Congenital hypothyroidism is a critical cause of elevated thyroid-stimulating hormone (TSH) in newborns; evaluate all neonates with an elevated TSH for congenital hypothyroidism (strength of recommendation [SOR]: A). Other causes of an elevated TSH include transient hypothyroidism due to neonatal illness, prematurity, iodine excess or deficiency, and maternal medication or maternal thyroid disease.
Journal of Family Practice, 57(3) 2008: 185-187.