A 34-year-old female asked:
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on 25mcg synthroid, (thyroxine)tsh reduced frm 4.67 to 2.61 in18 days.so decided 2 try to conceive.levels 12 days later-tsh 4.57; free t4 1.2; t3 103.whts d prob?

1 doctor answer
Dr. Philip Kern
42 years experience Endocrinology
Thyroid replacement: 25 mcg is a very low dose. It appears that such a low dose did not really affect your TSH. 4.67 to 2.61 could be just random lab variation. Your baseline TSH of 4.67 is very close to normal. If the goal is to lower TSH, you may need a higher dose, but talk to your doctor.
Answered on Oct 25, 2014
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