Infantile hypothyroidism

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1. check TSH, T4 in 3-5 days, if low T4 and high TSH

    1. Start levothyroxine 10-15mic/kg/day (tab 0.5mg, 0.1mg)

    2. check TSH monthly for 6 month, then every 2-3 month till 2y/o

    3. D/C drug in 3 y/o if TSH and T4 are corrected

2. Dosage based on age:

    1. 1-3 y/o ⇒ 4-6 mic/kg/day

    2. 3-10 y/o ⇒ 3-5 mic/kg/day

    3. 10-16 y/o ⇒ 2-4 mic/kg/day