How is menstruation less menstrual period long to return a responsibility

Menstruation volume is relatively small, menstrual period is likely to be caused by poor luteal function. Normal menstrual volume is between 30~80 ml, if less than 30 ml is a menstrual volume too small, if more than 7 days of time is a menstrual extension, if luteal function is not good, it is likely to cause the endometrium is not a one-time shedding, will cause menstrual volume is less, the main reason for menstrual extension. This situation can go to the hospital to do abdominal B-ultrasound examination, if the endometrium is thicker, do blood tests progesterone did not fall to the lowest value, may be caused by this situation, can be under the guidance of a doctor oral progesterone drug treatment, will help improve.