<prompt> All are true about Abnormal uterine bleeding except :Blood loss of less than 50 mlCycle duration is more than 35 days or less than 21 daysBleeding period lasting 7 days or moreIrregular bleeding during a regular cycle  <response>: Normal Menstrual Loss The upper limit of blood loss in a normal menstruation is considered as 80ml. Any bleeding above the specified normal limit is termed as abnormal uterine bleeding. Normal Menustration: Cycle interval-28days21-35 days Menustral flow- 4 to 5 days Menustral blood loss-35ml 20- 80ml Common causes of AUB: 1.DUB 2.Infections 3.Endocrine Dysfunction 4.Pregnancy Complications 5.Hematological disorders 6.Neoplastic growth. Reference: Textbook of Gynaecology; Sheila balakrishnan; 2nd edition; Page 48 DC Duttas Textbook of Gynecology; 7th edition ,page 152 