Gonadotropin Surge
The rapid, dramatic increase in luteinizing hormone levels that naturally triggers ovulation in unstimulated cycles.
Full Definition
A gonadotropin surge refers to the sudden and significant elevation of luteinizing hormone (LH) that occurs naturally mid-cycle in response to rising estradiol levels from mature follicles. This surge typically lasts 24-48 hours and initiates the final maturation of oocytes and subsequent ovulation approximately 36 hours later. In ART cycles, this natural surge is often prevented through medication protocols, and ovulation is instead triggered artificially with hCG or GnRH agonists. Premature gonadotropin surges can compromise cycle outcomes by causing premature ovulation before oocyte retrieval. Detection and management of LH surges are critical aspects of cycle monitoring and timing.
Usage
Usage note: Capitalize only when beginning a sentence. Distinguish from artificially induced ovulation triggers in clinical documentation.
In Context
- "The premature gonadotropin surge necessitated immediate oocyte retrieval to prevent follicle rupture." — Cycle monitoring report
- "GnRH antagonist protocols effectively prevent spontaneous gonadotropin surges during stimulation." — Treatment protocol documentation