• Luteinizing Hormone (LH)
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Luteinizing Hormone (LH)

Luteinizing Hormone (LH)

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The Luteinizing Hormone (LH) test measures the level of LH, a hormone produced by the pituitary gland that is critical for regulating the reproductive system in both men and women. In women, LH triggers ovulation and supports the menstrual cycle, while in men, it stimulates testosterone production. Abnormal LH levels can indicate various conditions, such as polycystic ovary syndrome (PCOS), menopause, or fertility issues. This test is important for anyone looking to assess their reproductive health and hormone balance, especially those experiencing symptoms related to menstrual irregularities or fertility challenges.

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About This Test

Reason to Check It

Luteinizing hormone (LH) is produced by the pituitary gland and it helps in the production of testosterone.  Some men who possess elevated levels of LH demonstrate evidence of decreased testosterone production by the testes - this is called primary hypogonadism and is rare and should result in consultation with a urologist.

Test Preparation

  • Fasting (Overnight) required for 10-12 hours


Please Note: We recommend overnight fasting and an early morning blood draw for all tests, even if no special preparation is required. Remember, it is OK to drink plenty of water. Drinking water helps hydrate you and makes it easier for the phlebotomist to obtain your blood sample.

Test Type and Method

Test Type:

  • Blood


Test Method:

  • In-person Blood Draw

Post-Test Notes

  • Once your specimen is collected, test results are typically processed and available within a few business days. Processing times may vary depending on the test. Your results will be delivered in a clear, easy-to-understand report. If any values fall outside the expected range, you may receive a follow-up call from an independent healthcare coordinator.

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations

Lab Testing is Simple, Fast, and Convenient

Choose the Individual Test or Lab Panel that suits your health needs. You’ll receive your lab requisition within 24 hours. Visit any of the 3,000+ Quest Diagnostics centers using the button below. Once your sample is collected, your results will be securely delivered via email within 7–10 days.

View Quest Draw Locations