What is the normal range for LH and FSH?
LH and FSH are the hormones that encourage ovulation. Both LH and FSH are secreted by the pituitary gland in the brain. For example, it is typical for women with PCOS to have an LH level of about 18 mlU/ml and a FSH level of about 6 mlU/ml (notice that both levels fall within the normal range of 5-20 mlU/ml).
- If you're a woman, abnormally high levels of LH during nonovulatory times in your menstrual cycle may mean you are in menopause. It may also mean that you have a pituitary disorder or polycystic ovary syndrome. Low levels of LH may mean you have a pituitary disorder, anorexia, malnutrition, or are under stress.
- Its peak time may last from 12 to 24 hours, but you have to do the test around mid-afternoon to get the best chance of catching the surge. Note that small amounts of LH may be present in the blood and urine all the time. However, just before ovulation, this amount surges up to five times the usual amount.
- FSH stimulates the ovarian follicle, causing an egg to grow. It also triggers the production of estrogen in the follicle. The rise in estrogen tells your pituitary gland to stop producing FSH and to start making more LH. The shift to LH causes the egg to be released from the ovary, a process called ovulation.
Luteinizing hormone (LH) is a hormone associated with reproduction and the stimulation of the release of an egg from the ovary (ovulation) in women and testosterone production in men. This test measures the amount of luteinizing hormone in the blood or urine.
- A high FSH level may indicate an imbalance with the testes or ovaries ability to function properly. In women, the FSH test (it is a blood test) is taken on the 3rd day of the menstrual period. Doctors believe levels higher than 10-15mIU/L may indicate diminished fertility, poor egg health or low ovarian reserve.
- Before puberty - 0 to 4.0 mIU/mL (0 to 4.0 IU/L) During puberty - 0.3 to 10.0 mIU/mL (0.3 to 10.0 IU/L) Women who are still menstruating - 4.7 to 21.5 mIU/mL (4.5 to 21.5 IU/L) After menopause - 25.8 to 134.8 mIU/mL (25.8 to 134.8 IU/L)
- The luteal phase is one stage of your menstrual cycle. It occurs after ovulation (when your ovaries release an egg) and before your period starts. During this time, the lining of your uterus normally gets thicker to prepare for a possible pregnancy.
The LH test measures the amount of LH in the blood or urine. High levels of LH are normal if you are in menopause. If you are younger than 40, high LH levels could suggest premature menopause, polycystic ovary syndrome (PCOS), or a genetic or congenital condition that affects the production of hormones.
- Each cycle can be divided into three phases based on events in the ovary (ovarian cycle) or in the uterus (uterine cycle). The ovarian cycle consists of the follicular phase, ovulation, and luteal phase whereas the uterine cycle is divided into menstruation, proliferative phase, and secretory phase.
- It is commonly believed that lower estrogen levels account for the rise in FSH that coincides with menopause. Rising FSH stimulates the remaining follicles to increase (rather than decrease) the estrogen level during the late reproductive years. All of this can occur 2 to 3 years prior to the last menstrual cycle.
- No, it's not possible to ovulate without an LH surge, and3. Yes, it's possible that your LH surge might not be picked up by an OPK (ovulation predictor kit) but still trigger ovulation. This is known as a 'false peak' and explains why women sometimes see fertile cervical fluid without actually ovulating.
Updated: 9th October 2018