Background
We assessed the effect of levothyroxine (LT4) therapy on gestational hypertension (GH) and preeclampsia (PE) in subclinical hypothyroidism (SCH), overt hypothyroidism (OH), or thyroperoxidase antibody (TPOAb) positivity.
Methods
Scopus, Medline, Science Direct, ProQuest, Google Scholar, and Cochrane library were scientifically searched for randomized controlled trials (RCTs), cohorts, and case-control studies assessing the effect of levothyroxine on incidences of GH or/and PE compared to control or placebo up to November 2022.
Results
After LT4 therapy in women with SCH, the ORs of GH and PE were not significantly different from compared groups; also, in OH, and studies recruited both SCH or OH subjects. LT4 reduced GH in TPOAb + women compared with a non-treated group, while after treatment in TPOAb + versus TPOAb- women, the ORs of GH and PE did not change significantly.
Conclusion
After LT4 therapy, the ORs of GH and PE did not significantly change in SCH, OH, SCH or OH participants compared to controls; also, in TPOAb + compared to TPOAb- equivalents. Reduction of GH in treated TPOAb + versus non-treated TPOAb + women refers to the importance of TPOAb determination. Insignificant changes of both ORs in treated SCH compared to untreated indicates whether SCH increases the incidence of GH and PE.