Luteinizing Hormone (LH Test) Test
Pituitary gland produces Luteinizing Hormone (LH) – a gonadotropin hormone. LH is important for fertility, sexual health and pregnancy. It is helpful in ovulation in women and testosterone production in males. The LH test is used to measure the levels of LH in the blood.
Why is the test ordered?
The test is helpful in assessing infertility and hypogonadism, as well as in predicting ovulation and diagnosing the condition of the pituitary glands. It is also helpful in diagnosing both ovarian and testicular dysfunction. The test may be ordered in children to help diagnose early or late puberty. In women, the test may be ordered as a supportive test for assessing menstrual irregularities.
When is the test ordered?
The test may be ordered for a woman with irregular menstrual periods, or absence of periods and if she is not getting pregnant. The test may be recommended for a man if he has low testosterone and low sex drive. The test may also be recommended when pituitary disorder is suspected. A physician may order the LH test when an adolescent’s puberty is delayed or occurs too early.
How is the sample collected?
A blood sample is collected from a vein in the arm.
How to prepare for the test?
It is better to inform the doctor about all the medicines and supplements one is taking. A woman should tell her doctor about the first day of her last period. If a person has had taken a test involving the administration of radioactive substance a week before the test, the doctor should be informed as these substances affect the test results.