Quick Facts
- Sample: Blood
- Fasting: No fasting required. Stop biotin consumption at least 72 hours before collection.
- Turnaround: 1-2 days. May take longer based on weather, holiday, or lab delays.
What This Test Measures
This test measures Luteinizing Hormone (LH), a stimulating hormone produced by the pituitary gland. LH is part of the hypothalamic-pituitary-gonadal system, in which the hypothalamus releases gonadotropin-releasing hormone (GnRH), prompting the pituitary to release LH and follicle-stimulating hormone (FSH). LH then signals the ovaries or testicles to support reproductive function.
This test reports your circulating LH level directly. It does not measure FSH, estrogen, testosterone, or any other reproductive hormone the pituitary or gonads may produce. LH results reflect pituitary signaling activity, not the output of the ovaries or testicles themselves.
Benefits
- Measures circulating LH to support fertility and reproductive evaluations.
- Helps assess possible pituitary or hypothalamic involvement in symptoms.
- Offers insight into hormone signaling related to menstrual irregularities.
- Supports evaluation of low sperm count or reduced sex drive in men.
- Provides a data point for discussing reproductive health with a provider.
Who Is This Test For?
- Women experiencing difficulty getting pregnant.
- Women with irregular or absent menstrual periods.
- Men with a low sperm count or decreased sex drive.
- Men whose partner is having difficulty getting pregnant.
- Individuals with symptoms suggesting a pituitary or hypothalamic disorder.
How It Works
- Order Your Test Online
- Visit a Local Lab
- Get Results Online
FAQ
1. What is the purpose of this hormone test?
This test measures Luteinizing Hormone (LH), a stimulating hormone released by the pituitary gland that signals the ovaries or testicles as part of reproductive function. A healthcare provider may use the result to help evaluate fertility concerns, menstrual irregularities, or possible pituitary or hypothalamic function issues. The test reports LH only and does not provide a complete hormonal evaluation on its own.
2. Who may benefit from this test, and when should it be ordered?
This test may be appropriate for women having difficulty getting pregnant or experiencing irregular or absent menstrual periods. It may also benefit men with a low sperm count or decreased sex drive, as well as men whose partner is having difficulty getting pregnant. People experiencing symptoms that may relate to pituitary or hypothalamic function may also consider testing as part of a broader evaluation.
3. How does this test differ from other hormone tests?
This test measures LH, a pituitary-stimulating hormone, rather than hormones produced directly by the ovaries or testicles. It does not measure FSH, estrogen, testosterone, or any other reproductive hormone. Because LH reflects pituitary signalling rather than gonadal hormone output, it provides different information from direct measurements of ovarian or testicular hormones.
4. Do I need to prepare for this test?
No fasting is required. You should stop consuming biotin at least 72 hours before blood collection.
5. How quickly will I receive my results?
Results are typically available within 1–2 days. Turnaround may take longer because of weather, holidays, or laboratory delays.
6. How do I interpret the results?
Interpretation depends on factors such as your sex, age, symptoms, and overall health history. A healthcare provider may consider LH alongside other reproductive hormone results, such as FSH, to develop a fuller picture. One abnormal result does not automatically confirm a hormonal condition, and one normal result does not rule one out.
Disclaimer: Reference ranges may vary by laboratory. Listed ranges are general guidelines and may differ from those used by the performing lab. Always consult your healthcare provider for interpretation.
7. What should I do if my results are abnormal?
Review LH results that fall outside the expected range with a qualified healthcare provider. Based on your symptoms and health history, they can determine whether additional evaluation or testing is appropriate.
8. How often should I get tested?
There is no standard repeat-testing schedule for this test. Your healthcare provider should determine the appropriate frequency based on your individual health needs and reasons for testing.
Pre test preparation
No fasting is required for this test. Stop biotin consumption at least 72 hours prior to your blood collection.
