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.
A: Women are born with approximately one- to two-million oocytes (eggs). By the time a woman reaches puberty, average age being about 12 years, she has roughly 300,000 to 400,000 eggs remaining. On average, 1,000 eggs are lost each month during her reproductive years, from the onset of puberty to menopause.