Sometimes, a small sample of tissue may be taken with small tools inserted through the vagina during a transvaginal ultrasound. In all three types of pelvic ultrasound, the transducer sends the reflected sound waves to a computer, which makes them into a picture that is shown on a video screen.
So the number of egg-containing follicles remaining in the ovary undergoes a steady decline from an average of 400,000 eggs at age eighteen to an average of 25,000 eggs by age thirty-seven. After age thirtyseven or thirty-eight, there is then a very dramatic acceleration of the monthly decline of remaining eggs.
Although eggs are an excellent source of protein and other nutrients, women who eat too many eggs each week are at risk for developing high blood cholesterol and heart disease. According to the U.S. Department of Health and Human Services, heart disease is the leading cause of death in U.S. women. Therefore, MedlinePlus encourages females to limit egg consumption to four eggs per week.