There is no clear data on what percentage of abortions are medically necessary. However, a study by Statpearls found that medical complications for the woman accounted for 2% of all abortions in the United States. It is important to note that certain medical conditions may require the termination of a pregnancy to avoid fatal complications for the mother. Abortions occurring at or after 21 weeks gestational age are rare, with approximately 5,200 abortions per year occurring at or after 21 weeks. However, very limited data exists on the percentage of abortions that are medically necessary.