Sir, I read with interest the article by Tindall, Griffiths & Penn.' They conclude that 'scintigraphy has been shown to be of little practical value in... patients with hypothyroidism and therefore should not be requested'. This does not hold true for neonates who are identified by newborn screening to have connatal hypothyroidism, i.e. thyrotrophin above 7 mU/l and T4 below 6 ug/dl, as defined...
