TSH | FT4 | FT3 | Most Likely Explanation |
high | high | high | hyperthyroidism-? pituitary tumor |
low | low | low | secondary hypothyroidism-? pituitary failure |
high | normal | normal | mild subclinical hypothyroidism |
high | low | low | primary, full-blown hypothyroidism |
very low | high | high | ? on replacement therapy–or hyperthyroidism |
low | normal | normal | mild hyperthyroidism |
high | normal | low | ? secondary hypothyroidism |