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©2013 UpToDate ® Print Email Questions to ask to help quantify blood loss during menses How often do you change your sanitary pad/tampon during peak flow days? How many pads/tampons do you use over a single menstrual period? Do you need to change the pad/tampon during the night? How large are any clots that are passed? Has a medical provider told you that you are anemic? Women with a normal volume of menstrual blood loss tend to: change pads/tampons at ≥3 hour intervals, use fewer than 21 pads/tampons per cycle, seldom need to change the pad/tampon during the night, have clots less than 1 inch in diameter, not be anemic Adapted from Warner, PE, Critchley, HD, Lumsden, MA, et al. Am J Obstet Gynecol 2004; 190:1216.