The quality and number of egg cells depend on many factors, such as a method to perform hormone stimulation and a method used to perform a procedure of egg cell collection. The collection procedure is performed under general anaesthesia, under ultrasound monitoring and by experienced specialists. At the same time, physicians cooperate with embryologists who constantly work together in order to obtain the best possible material from each patient.
OQA – Oocyte Quality Assessment
The whole procedure is performed according to a unique standard – OQA – Oocyte Quality Assessment – that has been prepared by a team at the INVICTA In Vitro Laboratory managed by Dr Joanna Liss.
At INVICTA Clinics, embryologists are constantly communicating with a physician who collects cells during a procedure, and they monitor the presence of a cumulus in an ovarian follicle. Then, the quality of a cumulus is assessed and it should contain an egg cell. The assessment of an egg cell is performed after separation of granulosa cells. The following parameters are mainly assessed at INVICTA Clinics: cell maturity, structure of the egg cell cytoplasm, thickness of the zona pellucida, thickness of the space below the zona pellucida, morphology of the first polar body, cell size.
If we know that fertilisation of egg cells was poor in the previous cycle, it is possible to stimulate internal mechanisms helping the introduction of the sperm into an egg cell to facilitate fertilisation – oocyte activation using calcium ionophores.