
This cross-sectional study analyzed first-trimester hemoglobin (Hb) levels and their association with adverse pregnancy outcomes in Western China, using data from 454,815 pregnant women between 2019 and 2023. The average Hb concentration was 126.0 ± 10.5 g/L, with anemia observed in 5.8% of participants. Elevated Hb (≥140 g/L) significantly increased risks for gestational diabetes mellitus (GDM) (aOR 1.57, 95% CI 1.52–1.62) and gestational hypertensive disorders (GHD) (aOR 1.87, 95% CI 1.79–1.96), while both low (≤99 g/L) and high Hb levels were linked to preterm birth. A U-shaped relationship was identified for cesarean delivery, low birthweight, and small-for-gestational-age infants. No significant association was found for stillbirth or low Apgar scores. These findings highlight the importance of managing anemia and monitoring high Hb levels during early pregnancy to mitigate risks.
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