Prenatal anemia and iron deficiency are associated with adverse birth outcomes, but no previous studies have examined the relation between preconception anemia, iron deficiency, and pregnancy outcome in healthy women. We measured hemoglobin (Hb), ferritin, transferrin receptor (TfR), and vitamins B-6, B-12, and folate concentrations before pregnancy in 405 Chinese women (median time from sample collection to gestation end = 316 d). Both mild (95 /=60 microg/L) ferritin were also significantly associated with lower birthweight (106 and 123 g, respectively). The risks of low birthweight (LBW) and fetal growth restriction (FGR) were significantly greater among women with moderate anemia compared with nonanemic controls [odds ratio (OR): 6.5; 95% CI: 1.6, 26.7; P = 0.009 and OR: 4.6; 95% CI: 1.5, 13.5; P = 0.006, respectively]. TfR and low ferritin were not associated with adverse birth outcome, but elevated ferritin, which could be a marker of inflammation, was associated with increased risk of LBW (OR: 2.2; 95% CI: 0.9, 5.7; P = 0.09) and FGR (OR: 2.7; 95% CI: 1.3, 5.6; P = 0.008). Preconception anemia, particularly iron-deficiency anemia, was associated with reduced infant growth and increased risk of adverse pregnancy outcome in Chinese women.

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