My daughter (17) recently had an abnormal menstrual flow of 18 days. about 10 days later, I had her go in for testing - full panel of lipids, thyroid, a1c, hormones, etc. She had an elevated RDW of 15.1 and a normal range MCV. Would that elevated RDW be caused by the abnormal menstrual cycle? Or can it be an iron deficiency? thanks!