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The association between the type of progesterone supplementation and miscarriage risk in women who have had a positive pregnancy test following embryo transfer: a retrospective cohort study

  • Gynecologic Endocrinology and Reproductive Medicine
  • Published:
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Abstract

Purpose

The purpose of this study was to identify if switching from intramuscular (IM) to vaginal progesterone compared to staying on IM progesterone after a positive pregnancy test following embryo transfer (ET) is associated with miscarriage risk.

Methods

A retrospective cohort study was performed in a private university-affiliated fertility clinic and included women aged 18–50 years with a positive pregnancy test following ET. The two groups studied were: women who stayed on IM progesterone following a positive pregnancy test and those who switched to vaginal progesterone after a positive test. The main outcome measured was risk of miscarriage < 24 weeks gestation as a proportion of non-biochemical pregnancies.

Results

1988 women were included in the analysis. Among the baseline characteristics, the presence of prior miscarriages as well as prior failed ETs, and frozen cycles (vs fresh) as type of transfer were associated with IM progesterone use (p values ≤ 0.01). As per miscarriage risk < 24 weeks, 22.4% (274/1221) of patients in the IM progesterone group experienced a miscarriage compared with 20.7% (159/767) in the vaginal progesterone group (OR 0.90; 95% CI 0.73–1.13). A multivariable logistic regression model revealed an adjusted OR (aOR) of 0.97 (95% CI 0.77–1.22).

Conclusion

This study suggests that switching from IM to vaginal progesterone after a positive pregnancy test following an ET is not associated with miscarriage risk. Considering that IM progesterone imposes substantial discomfort, this study offers reassurance and some flexibility in treatment protocols. Further prospective studies are necessary to corroborate the results of this study.

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Data availability

The authors confirm that the data supporting the findings of this study is available within the article. The final dataset used for the analysis in this study is available from the corresponding author upon reasonable request.

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Acknowledgements

We thank Dr. Laura Woods (University of London) for her support throughout the project.

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The authors declare that no funds, grants or other support was received during the preparation of this manuscript.

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Contributions

All authors contributed to the study conception and design. Material preparation and data collection were performed by TS, NZ, LL and SP. Data analysis was performed by TS. The first draft of the manuscript was written by TS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Talya Shaulov.

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The authors have no relevant financial or non-financial interests to disclose.

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Access to patients’ files was approved by the Quebec Commission of access to information (ref: 1014586-S). Ethics approval was obtained by the University of Montreal Hospital Center Research Ethics Committee (CR-CHUM; ref: 15.387).

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Shaulov, T., Zanré, N., Phillips, S. et al. The association between the type of progesterone supplementation and miscarriage risk in women who have had a positive pregnancy test following embryo transfer: a retrospective cohort study. Arch Gynecol Obstet 308, 569–577 (2023). https://doi.org/10.1007/s00404-023-07047-z

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