Back to matchesWe found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleRe: Use of serum progesterone measurements to reduce need for follow-up in women with pregnancies of unknown location.AuthorsBignardi, T.; Condous, G.AbstractA letter to the editor is presented in response to the article "Use of serum progesterone measurements to reduce need for follow-up in women with pregnancies of unknown location," by A. Day and colleagues in the 2009 issue.SubjectsLETTERS to the editor; PREGNANCYPublicationUltrasound in Obstetrics & Gynecology, 2009, Vol 34, Issue 3, p361ISSN0960-7692Publication typeLetterDOI10.1002/uog.7323