Hypothyroidism:Differential
Elevated TSH may be adaptive response in pt recovering from severe nonthyroidal illness - Retest 2-3 months
False elevations: Estrogens, methadone, 5-FU, Tomoxifen, Liver disease, HIV
False Lows: Glucocorticoids, androgens, salicylates, antiseizure meds, Lasix, acute illness