COVID-19 may increase the risk of blot clots in women who are pregnant or taking estrogen with birth control or hormone replacement therapy, according to a new manuscript published in the Endocrine Society’s journal, Endocrinology.

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One of the many complications of COVID-19 is the formation of blood clots in previously healthy people. Estrogen increases the chance of blood clots during pregnancy and in women taking birth control pills or hormone replacement therapy. If infected with COVID-19, these women’s risk of blood clotting could be even higher, and they may need to undergo anticoagulation therapy or to discontinue their estrogen medicines.

"During this pandemic, we need additional research to determine if women who become infected with the coronavirus during pregnancy should receive anticoagulation therapy or if women taking birth control pills or hormone replacement therapy should discontinue them,” said the study’s corresponding author, Daniel I. Spratt, M.D., of Maine Medical Center in Portland, Maine, and Tufts University School of Medicine in Boston, Mass. “Research that helps us understand how the coronavirus causes blood clots may also provide us with new knowledge regarding how blood clots form in other settings and how to prevent them.”