thyrotropin-releasing hormone ( trh ) , 200 mug i.v. , caused a brisk rise in tsh to 28 muu per ml , with t ( 4 ) rising to 28 mug per 100 ml , free t ( 4 ) to 5.6 , and t ( 3 ) to 730 ng per 100 ml , thus indicating that the pituitary-thyroid system was intact and that the patient 's tsh was biologically active .
C0040162
thyrotropin-releasing hormone
C0032002
pituitary