Ms. N.T.H is the first woman in Viet Nam to become pregnant with support of embryo vitrification, the most advanced technology for freezing embryos with high survival rates.
The Tu Du Maternal Hospital in Ho Chi Minh City is the vanguard in this frontier with 78 women having their embryos vitrificated since May this year.
Ultra-sound for 12 women, whose embryos were unfreezed and inserted into their uterus, have showned that six of them became pregnant, a success rate of 50 percent, said Dr. Ho Manh Tuong.
These embryos are growing normally, said Tuong, Head of the Childless Couples Department.
Embryo vitrification is expected to help ease overloaded maternal hospitals in Viet Nam, which receive requests for In Vitro Fertilisation (IVF) from some 3,000 couples every year but are able to treat just about 1,200 cases, Tuong said.
The survival rate for embryos during the vitrification freezing process is 99 percent against rates of between 60 and 70 percent in the slow-freezing method now commonplace in Viet Nam, Tuong said.
With this new technology, no machinery is needed for embryo freezing, whereas the slow-freezing method costs between 25,000 and 30,000 USD for each machine, Tuong added