fertilization rate
The percentage of mature eggs that successfully fertilize. A key metric in assisted reproductive technology outcomes.
Full Definition
Fertilization rate is a critical laboratory parameter that represents the percentage of mature oocytes that successfully undergo fertilization following insemination or intracytoplasmic sperm injection. Normal fertilization is confirmed by the presence of two pronuclei approximately 16-20 hours after insemination. Fertilization rates typically range from 65-85% for conventional IVF and 70-90% for ICSI, depending on various factors including oocyte and sperm quality, laboratory conditions, and underlying fertility diagnoses. Low fertilization rates may indicate gamete quality issues, laboratory problems, or the need for specialized techniques. This metric is essential for evaluating laboratory performance, predicting cycle outcomes, and making decisions about future treatment approaches including the potential need for donor gametes.
Usage
Usage note: Typically calculated as a percentage; distinguish from related terms like cleavage rate and blastulation rate.
In Context
- "The fertilization rate of 78% was within expected parameters for conventional IVF cycles." — Embryology laboratory report
- "Consistently low fertilization rates may indicate the need for intracytoplasmic sperm injection." — Treatment recommendation