Unfortunately, however, although the availability of medical abortion in the US has increased with time, it has yet to achieve its full potential. In large part this appears to be due to two factors which inhibit providers from offering, and women from choosing, the procedure: 1) Although the approved US medical abortion regimen does not require providers to use ultrasound examination as part of the procedure, it has become common practice for providers to do so. This both increases the cost of the procedure and limits the number of facilities that can offer it. 2) While surgical abortion typically requires only one clinic visit, medical abortion requires (officially) three or (in practice) two visits, making it more expensive, less convenient, and less attractive to women.