Doctors use an important blood test called a complete blood count, or CBC for short, to measure the number of each blood cell in your blood sample. If the CBC shows a low number of red blood cells, white blood cells, or platelets, your doctor may look at the cells under a microscope.
In a typical menstrual cycle, estrogen made by the maturing ovarian follicle causes the glands to grow and the endometrium to thicken (partly through an increased blood supply).This thickening of the uterine lining is called the proliferative phase of the menstrual cycle.n a typical menstrual cycle, estrogen made by the maturing ovarian follicle causes the glands to grow and the endometrium to thicken (partly through an increased blood supply).
Uterine fibroid tumors can contribute to blood clots during a woman's menstrual period. A heavy flow is among the reasons for passing blood clots during a period. Birth control methods such as an intrauterine device (IUD) can cause a woman to pass blood clots during her period. Miscarriage can cause a woman to pass blood clots. Fibroid tumors that grow in the uterus can lead to blood clots during a period.