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Follicle-stimulating hormone (FSH) plays an integral role in reproductive processes. Doctors can test FSH levels to assess fertility, among other things. In people assigned female at birth,...
FSH levels are normally low in children. As puberty approaches (usually between ages 10 and 14), the hypothalamus produces gonadotropin-releasing hormone (GnRH), which triggers FSH and LH. This begins the changes toward sexual maturity and development.
FSH and LH are two hormones secreted by the pituitary gland in the brain during the menstrual cycle. Blood levels of these hormones are often tested to determine how your ovaries are functioning. FSH (follicle-stimulating hormone) is released when estrogen levels are low.
Luteinizing Hormone (LH) “Normal” Day 3 LH levels are 5-20 mIU/ml. If your LH levels are high in ratio to your FSH levels, this could indicate that you aren’t in menopause or going through premature ovarian failure, but instead have polycystic ovarian syndrome (PCOS) which can cause some similar symptoms ( source ).
An LH level test checks how much LH is in your blood and involves a simple blood draw. Sometimes, your healthcare provider will recommend doing an LH level test alongside an FSH test since these hormones work together to regulate your reproductive system.
Follicle stimulating hormone (FSH) is a type of sex hormone that works alongside luteinizing hormone (LH) to regulate key reproductive processes in both women and men. In women, FSH helps to stimulate the development of ovarian follicles, which eventually go on to release an egg during ovulation.
Luteinizing hormone (LH) works closely with FSH to regulate menstruation, generate the release of an egg from the ovary, produce estrogen in women and testosterone in men. Therefore, FSH and LH levels are drawn in both women and men to help understand their reproductive health.