<prompt> Secondary amenorrhea is defined asAbsence of menstruation for one normal menstrual cycleAbsence of menstruation for three normal menstrual cyclesAbsence of menstruation for six normal menstrual cycleAbsence of menstruation for one year  <response>: A woman who previously menstruated can develop secondary amenorrhea.Which is defined as absence of menstruation for three normal menstrual cycles. A woman with regular cycles and a delay of menses of even a week may warrant assessment with a pregnancy test.It is reasonable to evaluate a woman who has fewer than nine cycles per year.Reference: Berek and Novaks gynecology; 14th edition; Chapter 30; Amenorrhea 