Low serum TSH |
Primary hyperthyroidism |
Incomplete recovery from hyperthyroidism |
Nonthyroidal illness |
High levels of chorionic gonadotropin - early pregnancy, molar pregnancy, choriocarcinoma |
Drugs - dopamine agonists, glucocorticoids, somatostatin analogs |
Central hypothyroidism |
High serum TSH |
Primary hypothyroidism |
Recovery from nonthyroidal illness |
Drugs - dopamine antagonists, amiodarone, oral cholecystogram dye (sodium ipodate) |
TSH-producing pituitary adenoma |
Adrenal insufficiency |
Heterophilic antibody interference |
Generalized thyroid hormone resistance |
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