Eggs are stored within the ovaries and so are only released with the appropriate hormonal stimulation. So, the doctor collects a blood sample and checks it for three essential hormones: follicle-stimulating hormone (FSH), which triggers the growth of ovarian follicles just before ovulation; estradiol, which is manufactured principally with the https://iseodirectory.com/listings13013751/getting-my-egg-freezing-to-work