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Maternal and pediatric nutrition

The association of elevated serum ferritin concentration in early pregnancy with gestational diabetes mellitus: a prospective observational study

Abstract

Background/Objectives

The results linking body iron stores to the risk of gestational diabetes mellitus (GDM) are conflicting. We aimed to measure the serum ferritin level of women in early pregnancy and evaluate the risk of GDM in a Chinese urban population.

Subjects/Methods

In total, 851 pregnant women between 10 and 20 weeks of gestation took part in the prospective, observational study conducted. The women were divided into four groups by quartiles of serum ferritin levels (Q1–4). Their blood samples were collected and assayed for several biochemical variables at the beginning of the study, and the women were followed up with a 75-g oral glucose tolerance test at 24–28 weeks of gestation.

Results

The participants had an average serum ferritin concentration of 65.67 μg/L. GDM prevalence within each serum ferritin quartile was 9.4%, 14.6%, 18.8% and 19.3%, respectively, (P= 0.016). The odds ratio for GDM in the ferritin Q2–4 was 1.64 (CI: 0.90–2.99), 2.23 (CI: 1.26–3.96) and 2.31 (CI: 1.30–4.10), compared with Q1, respectively. This association persisted after adjusting for potential confounders factors. In addition, in Q4, pregnant women with a pre-pregnancy body mass index ≥24 kg/m2, maternal age ≤35 years old or haemoglobin≥ 110 g/L did have an increased risk of developing GDM.

Conclusions

Elevated serum ferritin concentrations in early gestation are associated with an increased risk of GDM, especially in pregnant women who have a high baseline iron storage status with no anaemia or who are overweight/obese. Individual iron supplementation should be considered to minimize the risk of GDM.

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Acknowledgements

The authors would like to give special thanks to all the participants of the study.

Funding

This study was supported by funds from the National Natural Science Foundation of China (Grant no. 81471469) and funds from the Science and Technology Commission of Shanghai Municipality (Grant no. 15411952900 and Grant no.14411965600).

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Authors

Contributions

HDC conceptualized the project. QYZ designed the study. HDC and QYZ reviewed the manuscript and take primary responsibility for the final content. YC and TTL analysed the data and wrote the manuscript. MLH and SPL organized the participants. KW and ZWM performed data collection. JXL and JBL performed the laboratory work. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Qingying Zhang or Haidong Cheng.

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Conflict of interest

The authors declare that they have no competing interests.

Ethics approval and consent to participate

This study was approved by the Ethics Committee of the Obstetrics and Gynecology Hospital, Fudan University, and all pregnant women provided consent to participate in the study.

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Cheng, Y., Li, T., He, M. et al. The association of elevated serum ferritin concentration in early pregnancy with gestational diabetes mellitus: a prospective observational study. Eur J Clin Nutr 74, 741–748 (2020). https://doi.org/10.1038/s41430-019-0542-6

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