Experts debate TSH threshold for levothyroxine use in pregnancy

A published debate examines differing views on when to initiate levothyroxine for pregnant women with TSH concentrations between 2.5 and 10 mIU/L, following recent guidelines that raised the treatment threshold to TSH 4.0 mIU/L or higher with normal thyroxine, and that recommend against treatment between 2.5 and 4.0 mIU/L. One clinician argues individualized treatment may still be reasonable for select women with TSH 2.5-4.0 mIU/L and supports considering treatment for TSH 4.0-10.0 mIU/L, citing biological heterogeneity and evidence gaps, while the other argues against routine treatment in this range, citing uncertain benefit and risk of overtreatment.

Most relevant for: Clinicians managing pregnant women with mild thyroid dysfunction, particularly subclinical hypothyroidism identified in the first trimester.

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