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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Triiodothyronine (T3) as compared to T4 :
assistant
The correct answer is  T3 is the main active thyroid hormone. It is more potent (less plasma protein bound) and faster acting than T4. How­ever, short duration of action limits its use for the treatment of hypothyroidism (requires lifelong treatment).
T3 is indicated for the treatment of myxedema coma.