The Risk of Elective Abortion in Women With Crohn's Disease and Ulcerative Colitis: A Nationwide Cohort Study.

Backgroud: Women with inflammatory bowel disease (IBD) might have an increased tendency to choose an elective abortion due to a fear that their fetus could be harmed by use of medications, disease flares during pregnancy, or for genetic reasons. We examined the risk of elective abortions in women with ulcerative colitis (UC) and Crohn's disease (CD) compared with women without IBD.

Methods: This nationwide cohort study, based on Danish health registries, comprises all registered pregnancies from 1996 through 2015. The 2 exposed groups constituted pregnancies of women with UC or CD, and the unexposed group constituted all pregnancies of women without IBD. Our outcome was elective abortion by maternal request up until the end of the 12th completed week of gestation. We used logistic regression models and calculated the odds ratio (OR) for an elective abortion, controlling for confounders.

Results: The overall prevalence rates of elective abortions in women with UC and CD and without IBD were 12.4% (898 elective abortions/7250 pregnancies), 14.9% (978 elective abortions/6559 pregnancies), and 16.9% (285,251 elective abortions/1,691,857 pregnancies), respectively. In women with UC and CD, the adjusted ORs for an elective abortion (95% confidence interval) were 0.80 (0.74-0.86) and 0.96 (0.89-1.04), respectively.

Conclusions: Pregnant women with IBD are not more likely to choose an elective abortion compared with women without IBD. These results are reassuring as they suggest that women with IBD are not so worried about a negative impact of their disease, disease activity, or medications that they would choose to terminate a pregnancy.