• Blastosis transfer
  • Recently , there is a remarkable development of stage specific sequential culture media which allows the embryos to develop further in vitro for up to 5-6 days after egg recovery and that embryo stage so called "Blastocyst". The advantages of blastocyst culture are to eliminate those embryos with little developmental competence and to facilitate the synchronization of embryonic stage with uterine endometrial development. This means that we can expect the higher pregnancy and implantation rate from the blastocyst transfer. However , there is considerable patient variation , which means that on the same day using the same media , one patient may get 90% blastocyst development while another patient get only 10%. Additional research data found that about 5 % of patients having blastocyst culture have not at least one embryo develop to blastocyst so they end up with no transfer.