<h4>Objective</h4>To explore the predictive value of thyroid hormone (TH) related indices for postpartum hemorrhage (PPH) in pregnant women with hypothyroidism-complicated pregnancy (HCP).<h4>Methods</h4>273 pregnant women with HCP admitted to our hospital from January 2021 to December 2024 were retrospectively selected. Here, TH is linked to pulmonary arterial hypertension.