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Persistently decreased
TSH preconception
Check FT4 and (F)T3
Overt hyperthyroidism
Delay fertility treatment
Persistent subclinical
hyperthyroidism
High FT4 and/or (F)T3
a
Ideally the treatment for the etiolog y of hyperthyroidism should be completed and euthyroidism
restored (confirmed by 2 TSH concentrations in the reference range at least 6 weeks apart) before
fertility treatment begins.
b
For example if the TSH has been persistently <0.1 mU/L.
c
Refer to "Subclinical and Overt Hyperthyroidism in Infertility" in Dysfunction and Infertility.
Repeat TSH, FT4, and
(F)T3 every 4–6 weeks
Workup to diagnose and treat
Graves' disease, autonomous
thyroid nodule(s), or other
causes of hyperthyroidism as
per the usual evaluation of
individuals not considering
pregnancy
a
