A luteinizing hormone test measures the amount of luteinizing hormone (LH) in a sample of blood or urine. LH is produced by the pituitary gland.
A luteinizing hormone (LH) test may be done to:
Many medicines can change your results. Some examples are cimetidine, clomiphene, and levodopa. You may be asked to stop taking medicines (including birth control pills) that contain estrogen or progesterone or both for up to 4 weeks before your luteinizing hormone (LH) test. Make sure your doctor has a complete list of all the prescription and over-the-counter medicines you take, including herbs and natural substances.
Tell your doctor if you have had a test that used a radioactive substance (tracer) in the last 7 days. Recent tests (such as a thyroid scan or bone scan) using this kind of tracer can affect your LH test results.
Let your doctor know the first day of your last menstrual period. If your bleeding pattern is light or starts with spotting, the first day is the day of heaviest bleeding.
Talk to your doctor about any concerns you have regarding the need for the test or its risks. You can also ask how it will be done and what the results will mean. To help you understand the importance of this test, fill out the medical test information form(What is a PDF document?).
The health professional drawing blood will:
For women, more than one blood sample may be needed to get a true reading of the luteinizing hormone (LH) levels. Several blood samples may be taken in one day. Or one sample may be taken each day for several days in a row.
To find out if you are ovulating, a sample of your first urine of the morning is usually tested. It is important to follow the package directions exactly if you are doing the test yourself at home.
You may also be given a plastic test strip to hold in the urine stream. The test strip has a colour indicator on it that can detect luteinizing hormone (LH).
The blood sample is taken from a vein in your arm. An elastic band is wrapped around your upper arm. It may feel tight. You may feel nothing at all from the needle, or you may feel a quick sting or pinch.
It is not painful to collect a urine sample.
There is very little chance of a problem from having a blood sample taken from a vein.
Collecting a urine sample does not cause problems.
A luteinizing hormone test measures the amount of luteinizing hormone (LH) in a sample of blood or urine.
How much LH a person has depends on his or her age and stage of sexual development. In a woman, it also depends on the phase of her menstrual cycle. The urine test to see if a woman is ovulating just finds out if a woman has LH in her body (positive result) or doesn't have LH in her body (negative result).
These numbers are just a guide. The range for "normal" varies from lab to lab. Your lab may have a different range. Your lab report should show what range your lab uses for "normal." Also, your doctor will evaluate your results based on your health and other factors. So a number that is outside the normal range here may still be normal for you. Ask your doctor for normal values of your test.
1.68–15 international units per litre (IU/L)
Most home urine tests to predict ovulation just look for the presence of LH, not how much LH is present. Home urine test results are either "positive" (LH is present) or "negative" (LH is not present).
Many conditions can change LH levels. Your doctor will discuss any important results with you in relation to your symptoms and past health.
High luteinizing hormone values in a woman may mean:
High luteinizing hormone values in a man may mean:
Low luteinizing hormone values in a man or woman may mean:
Results of the test may be affected by:
Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby Elsevier.
Other Works Consulted
Chernecky CC, Berger BJ (2008). Laboratory Tests and Diagnostic Procedures, 5th ed. St. Louis: Saunders.
Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.
ByHealthwise StaffPrimary Medical ReviewerSarah Marshall, MD - Family MedicineMartin J. Gabica, MD - Family MedicineE. Gregory Thompson, MD - Internal MedicineAdam Husney, MD - Family MedicineSpecialist Medical ReviewerFemi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology
Current as ofOctober 13, 2016
Current as of: October 13, 2016
Sarah Marshall, MD - Family Medicine
& Martin J. Gabica, MD - Family Medicine & E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Femi Olatunbosun, MB, FRCSC - Obstetrics and Gynecology
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