- Conditions with increased TBG (e.g., pregnancy and estrogen therapy)
- Early thyroid failure
- Hyperthyroidism (triiodothyronine is produced independently of stimulation by TSH)
- Iodine-deficiency goiter
- T3 toxicosis
- Thyrotoxicosis factitia (laboratory tests do not distinguish between endogenous and exogenous sources)
- Treated hyperthyroidism
- Acute and subacute nonthyroidal disease (pathophysiology is unclear)
- Conditions with decreased TBG (TBG is the major transport protein)
- Hypothyroidism (thyroid hormones are not produced in sufficient quantities regardless of TSH levels)
- Malnutrition (related to insufficient protein sources to form albumin and TBG)
Triiodothyronine, Total has been found in Davis's Lab & Diagnostic Tests
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