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Luteinizing Hormone Surge

Published: July 27, 2026Updated: August 25, 2026

The Luteinizing Hormone (LH) surge is a rapid increase in LH levels that triggers ovulation in females. It is a critical biomarker for assessing fertility and predicting ovulation.

Quick summary

LH surge is a key indicator of ovulation and fertility.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 25, 2026Editorial policy

Key facts at a glance

Units
mIU/mL
Clinical utility
diagnostic
Result kind
quantitative
FDA-cleared
Roche LH Surge, Clearblue LH Surge
interpretation: {"text":"LH levels between 0–95 mIU/mL are considered within the normal range, indicating typical reproductive function.","label":"Normal"}; {"text":"Levels above 95 mIU/mL may suggest an LH surge, indicating that ovulation is likely to occur soon.","label":"Elevated"}

The LH surge is a sudden and significant increase in the levels of luteinizing hormone in the body, typically occurring just before ovulation in the menstrual cycle.

This surge is essential for the release of a mature egg from the ovary and is a critical component of the reproductive process.

Measuring LH levels can help in predicting the timing of ovulation, which is useful for individuals trying to conceive or for diagnosing fertility issues.

Frequently asked questions

What is the normal range for LH levels?
The normal range for LH levels is typically 0–95 mIU/mL.
How can an LH surge be detected?
An LH surge can be detected through blood tests or urine-based ovulation predictor kits.
  1. 1
    American Society for Reproductive MedicineSource
  2. 2
    Mayo ClinicSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy