Male factor evaluation in in vitro fertilization: Norfolk experience

Area of Science:

• Reproductive Medicine
• Andrology
• In Vitro Fertilization

Background:

• Male infertility significantly impacts in vitro fertilization (IVF) success rates.
• Assessing sperm parameters is crucial for predicting IVF outcomes.

Purpose of the Study:

• To critically review IVF outcomes in patients with abnormal male factors.
• To evaluate the correlation of various sperm parameters with fertilization rates in IVF.
• To determine optimal insemination concentrations for achieving successful fertilization.

Main Methods:

• Retrospective review of 33 patients undergoing IVF.
• Endocrine investigation and a battery of tests including the hamster zona-free oocyte penetration test.
• Analysis of fertilization rates based on sperm concentration and motility.

Main Results:

• Fertilization rates were significantly lower in the abnormal male population (39.6%) compared to normal (88.6%).
• Zero fertilization occurred when rapidly progressive sperm concentration was < 6 x 10(5)/mL or post-separation count was < 1.5 x 10(6).
• The hamster zona-free oocyte penetration test showed good correlation with human IVF, unlike other tested parameters.

Conclusions:

• Higher sperm concentrations per egg are necessary for optimal fertilization rates in males with abnormal sperm.
• Once fertilization is achieved, IVF outcomes (pregnancy and miscarriage rates) are comparable to the general IVF population.
• The hamster test may serve as a useful predictor of IVF success in male factor infertility.