The next day after fertilization, the embryologists check if the eggs have been fertilized by the sperm. This procedure must be done within 16-20 hours after inseminating with the sperm. The embryologist observes under the microscope whether or not normal or abnormal fertilization has been achieved.

See more:

• Normal fertilisation
• Abnormal fertilisation
• Can all oocytes be fertilised?
• Expected fertilisation rates
• Diagnostic value of IVF