Response to thyrotrophin releasing hormone in Klinefelter's syndrome.

In eleven patients with Klinefelter's Syndrome TSH, T4 and T3 levels have been measured after stimulation with TRH. The eleven patients included three who had been noted to have a low radioactive iodine uptake and two of these also had abnormally low T4 levels. Three of the patients were receiving androgen replacement therapy. A normal response to TRH was observed in all cases.