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. Your healthcare provider may use this measurement to help evaluate fertility concerns, menstrual irregularities, or possible pituitary or hypothalamic function issues. This test reports LH levels only and is not a complete hormonal evaluation on its own.
2. Who would benefit from this test?
Women having difficulty getting pregnant or experiencing irregular or absent menstrual periods may consider this test. Men with a low sperm count, decreased sex drive, or whose partner is having difficulty getting pregnant may also benefit. Individuals with symptoms that suggest a pituitary or hypothalamic disorder may find this test relevant to their evaluation.
3. When should I order this test?
You might consider this test if you are experiencing fertility challenges, irregular menstrual cycles, or symptoms that could relate to pituitary or hypothalamic function. Men noticing changes such as reduced sex drive or low sperm count may also consider ordering this test. This test is one part of a broader evaluation your healthcare provider may recommend.
4. How does this test differ from other hormone tests?
This test specifically measures LH, a pituitary stimulating hormone, rather than the hormones LH stimulates, such as those produced by the ovaries or testicles. It does not measure FSH, estrogen, testosterone, or any other reproductive hormone. Because LH reflects pituitary signaling rather than gonadal hormone output, it provides different information than tests that measure ovarian or testicular hormones directly.
5. Do I need to fast before this test?
No fasting is required for this test. You should stop biotin consumption at least 72 hours prior to your blood collection.
6. How quickly will I get results?
Results are typically available in 1-2 days. Turnaround may take longer based on weather, holidays, or lab delays.
7. How do I interpret the results?
Interpreting your LH result depends on factors such as your sex, age, symptoms, and overall health history. Because LH is a stimulating hormone, your provider may consider it alongside other reproductive hormone results, such as FSH, to build 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.
8. What should I do if my results are abnormal?
If your LH results fall outside the expected range, review them with a qualified healthcare provider. Your provider can help determine whether additional evaluation or testing is appropriate based on your symptoms and health history. This result alone does not provide a complete clinical conclusion.
9. How often should I get tested?
Testing frequency should be determined as directed by your healthcare provider, based on your individual health needs and reasons for testing. There is no standard repeat testing schedule for this test.
Pre test preparation
No fasting is required for this test. Stop biotin consumption at least 72 hours prior to your blood collection.
