Triiodothyronine (Total T3)
T3 is the active thyroid hormone. It affects metabolism, heart rate, body temperature, and brain function. Most T3 is converted from T4.
Unit: ng/dL
High T3 indicates hyperthyroidism — overactive thyroid. Can cause rapid weight loss, anxiety, insomnia, and irregular heartbeat.
Low T3 can indicate hypothyroidism or 'sick euthyroid syndrome' (non-thyroid illness). The body sometimes lowers T3 during serious illness.
Disclaimer: Reference ranges may vary between laboratories. This is educational information, not medical advice. Upload your complete lab report in the GoDavaii app for AI-powered analysis in context of your health profile.
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