Eggs are stored during the ovaries and therefore are only produced with the best hormonal stimulation. So, the health practitioner collects a blood sample and exams it for 3 vital hormones: follicle-stimulating hormone (FSH), which triggers the growth of ovarian follicles in advance of ovulation; estradiol, that is manufactured mainly https://pasteldirectory.com/listings13020269/egg-freezing-for-dummies