Minimal requirements for ejaculates used for in vitro fertilization

Area of Science:

• Reproductive biology
• Microbiology

Background:

• Sperm quality is crucial for successful in vitro fertilization (IVF).
• Bacterial and mycoplasma contamination in ejaculates can impact IVF outcomes.

Purpose of the Study:

• To define minimal requirements for ejaculates used in human oocyte IVF.
• To investigate the impact of microbial contamination on IVF fertilization rates.

Main Methods:

• Analyzed 140 ejaculates for sperm parameters (concentration, motility, morphology).
• Assessed bacterial and mycoplasma concentrations in ejaculates.
• Correlated microbial contamination levels with oocyte fertilization and embryo transfer rates.

Main Results:

• Required sperm concentration: ≥5 x 10^6/ml; motility: ≥30%; morphology: ≥30%.
• Bacterial contamination (>10^5/ml) found in 42.9% of ejaculates; Mycoplasma in 21.4%.
• Fertilization rates were not significantly reduced by microbial contamination.

Conclusions:

• Established minimal sperm quality criteria for IVF.
• Microbial contamination of sperm does not appear to directly inhibit human oocyte fertilization in IVF.