Luteinizing Hormone and LH Testing

The source of luteinizing hormone is pituitary gland. The purpose of a luteinizing hormone test is to measure the quantity of luteinizing hormone (LH) that is available in a sample of blood or urine. The functions of women’s LH are to help the menstrual cycle’s and egg production’s (ovulation’s regulation. The LH found in a womans body can vary according to the menstrual cycle’s phase. Before ovulation the quantity of LH increases suddenly, it may happen on the 14th day of a 28-day cycle. This process is called a LH increase. During the monthly menstrual cycle luteinizing hormone and follicle-stimulating hormone levels become higher or lower. The purpose of men’s LH is the stimulation of the testosterone’s production. Testosterone is responsible for sperm production.

The purpose of a luteinizing hormone (LH) test is:
1) To find out why a couple is unable to get pregnant (the medical term is infertility). During this testing a womans egg quantity (ovarian reserve) and a mans sperm availability are examined.
2) To evaluate menstrual problems, such as irregular or absent menstrual periods (amenorrhea).  It is done to find out whether the woman has had menopause.
3) To find out whether a child is now at the process of early puberty or precocious puberty. Puberty is considered to be early when it begins in girls at the age younger than 9 and in boys at the age younger than 10.
4) To find out why there is no proper development of sexual features or organs. The medical term for it is delayed puberty.
5) To find out using a urine sample the time of a woman’s ovulation. Home urine tests for ovulation can also be held.
6) To monitor a womans reaction to medicines which have been taken inside for ovulation’s stimulation.

It is recommended to follow the next recommendations before LH testing:
1) You should stop consuming medicines that have estrogen or progesterone in its content (among such medicines there are birth control pills) within 4 weeks before having a luteinizing hormone (LH) test.
Many medicines, among them there are cimetidine, clomiphene, digitalis, and levodopa have an ability to influence the test’s results. You should supply your doctor with information about all medicines, herbs and natural substances being taken by you.
2) Inform your doctor about a test conducted with a radioactive substance (tracer) you have been passed though within the last 7 days. If you have passed a thyroid scan or bone scan tests with a radioactive tracer recently, these tests can influence LH test results.
3) Inform your doctor about the first day of your last menstrual period. If you observe that your bleeding pattern is light or starts with spotting, the first day is considered to be the day of heaviest bleeding.
4) Ask your doctor about everything you are interested in: the necessity of the test, its risks, its procedure and possible results.
The purpose of a luteinizing hormone test is to measure the quantity of luteinizing hormone (LH) that is available in a sample of blood or urine.

The factors that influence LH levels are a persons age, sexual development’s stage and the phase of her menstrual cycle. The purpose of urine test is to define whether a woman is ovulating and to observe the presence (positive result) or absence (negative result) of LH.