Fertilization of Eggs can either be performed by using classic IVF or ICSI
Classic IVF (In Vitro Fertilization)
This method is employed when the spermatozoa are normal in concentration, motility and morphology. Approximately 1 million sperm cells (adjusted by their final concentration after wash) per egg are dispersed in a drop of insemination medium and incubated at 37 o C with 5-6% CO2, until the next day. The sperm cells are left to penetrate the outer membrane of the egg, on their own, to fertilize the egg. Fertilization is determined 17-19 hours after insemination.
ICSI (Intracytoplasmic Sperm Injection)
The method of ICSI (intracytoplasmic sperm injection) is mainly used when the semen analysis is abnormal, i.e. when the sperm count is low, when there is low motility or severe morphological defects.
This method is also applied in cases where classic IVF has been tried multiple times and failed, in the presence of sperm antibodies and occasionally in patients with a small number of retrieved oocytes. It is also applied in cases of idiopathic infertility.
During ICSI, the embryologist manually selects the normal looking spermatozoa and injects each egg with a spermatozoon, using special equipment and micro tools. Fertilization is confirmed the following morning.
Guinness World Records
“Oldest mother to have delivered with IVF
A woman aged 49 years 54 days (b. Cyprus) gave birth by Caesarean section to a baby girl 2850g 101oz in October 1990. The fertilized egg had been implanted in the patient’s womb under the supervision of Dr. Trokoudes, Director of the Pedieos IVF Center in Nicosia, Cyprus.’’ Guinness Book of Records, 1992