Weight and Procedural Abortion Complications: A Systematic Review

Objective: To systematically assess the existing empiric evidence regarding a potential relationship between higher body weight and procedural abortion complications.

Data sources: EMBASE, MEDLINE, CINAHL, Web of Science, Google Scholar, and Clinicaltrials.gov were searched.

Methods of study selection: Our search identified 409 studies, which were uploaded to Covidence for review management; 133 duplicates were automatically removed. A team of two reviewers screened 276 studies, and a third reviewer resolved conflicts. Studies were included if they 1) consisted of peer-reviewed research published between 2010 and 2022, 2) were conducted in the United States, 3) included people with a higher body weight (body mass index [BMI] 30 or higher) in the study sample, and 4) assessed at least one outcome of procedural abortion safety stratified by a measure of body weight.

Tabulation, integration, and results: We extracted study data using Covidence and calculated an odds ratio for each study to facilitate the synthesis of results. Six studies assessing a total of 38,960 participants were included. No studies found a significant relationship between procedural abortion complications and higher body weight overall. Subgroup analysis from one study identified a significant increase in complications specifically among participants with BMIs higher than 40 who had second-trimester abortions. All studies used a retrospective cohort design and fulfilled Newcastle-Ottawa Scale criteria to be considered good quality. Studies varied in terms of clinical settings, patient populations, gestations assessed, clinician training levels, and care protocols.

Conclusion: Overall, higher body weight was not associated with an increased risk of procedural abortion complications in the included studies. The practice of referring patients undergoing procedural abortion with a higher body weight for hospital-based care is not based on recent safety evidence. On the contrary, this practice threatens the health of people with a higher body weight by potentially delaying their access to abortion care, extending their pregnancies into later gestations, and blocking their ability to access an abortion altogether.