A 17-year-old male asked:
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i have hypothyroidism. my tsh was 4.75 when discovered. was put on 25 mcg of synthroid (thyroxine). after 5 weeks we checked it again and tsh went up to 5.28. so i was put on 50 mcg. now tsh is 2.5 typically but free t4 is 1.6. is this normal?

2 doctor answers
Dr. Kenneth Smith
31 years experience Internal Medicine
Hypothyroid: Hypothyroidism yes T4 inactive synthesis T4 converted to T3 (liothyronine) active . Tsh good will equilabrate.
Answered on Apr 8, 2015
Dr. David Geffner
53 years experience Endocrinology
Yes: Although putting an asymptomatic young man with a TSH of 4.75 on thyroxine to begin with is controversial (what was your original t4?) a free T4 of 1.6 is ok.
Answered on Jun 4, 2015
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