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).
Menstruation is a womanâs monthly bleeding, also called a period or menses. The bleeding happens when the thickened uterine lining (endometrium) sheds. During menstruation, the menstrual blood flows from the uterus through the small opening in the cervix, and passes out of the body through the vagina. 1  The endometrium is thin immediately after the menstrual bleeding has stopped.  The endometrium (about one week later).