T3, total, reduced
T3 will be reduced in congenital hypothyroidism, but otherwise it is not usually reduced in hypothyroidism.
Situations in which T3 may be falsely lowered:
- severe infection
- post myocardial infarction
- chronic liver disease
- chronic renal failure
- post surgery
- drug induced causes
Reference:
- Thyroid Function Tests. British Thyroid Foundation, revised 2021
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