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A 27-year-old female asked:

My tsh was low at 0.001, t3 was 134 & t4 free was 1.3. my doctor suggests redoing the test in 3 months. is it likely that this is the start of hyperthyroidism? i am 11 months postpartum & breastfeeding 2x a day. always had normal functioning thyroid?

1 doctor answer2 doctors weighed in
Dr. Clarence Grim
Endocrinology 57 years experience
Thyroid tests: Pregnancy and taking biotin can affect thyroid tests. But nothing beats talking and examining you to decide on next step. Discuss with your team. Go to uptodate.com and read more. Always send us normal values in your lab for any test you ask us about. Discuss with your team should be next step after doing assigned reading.

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Last updated Feb 20, 2021
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