immunoreactive trh levels in the serum were less than 60 pg/ml in normal subjects , were below the limit of detectability in hyperthyroid patients , were 40 to 400 pg/ml in primary hypothyroid patients , were 100 to 600 pg/ml in pituitary hypothyroid patients and below the limit of detectability in hypothalamic hypothyroid patients .
C0040162
trh
C0032002
pituitary