This program offers the possibility to achieve pregnancy through the transfer of embryos obtained
from the union of the donor's oocytes with sperm obtained from the husband, partner, or semen bank
as the case may be.
The technique used in Plenitas program to achieve egg fertilization is called ICSI, and it involves
the microinjection of a single sperm into an egg. This technique seeks to evaluate the maturity of the
eggs to offer eggs which are apt for normal fertilization.
In addition, the injection of sperms makes the first step of the fertilization process easier. Once
formed, the embryos are transferred to the recipient's uterus the second or third day following the
microinjection.
Requirements to join the program as a recipient:
To be admitted into the program, recipients should not be older than 50.
Preparing the endometrial lining:
Once admitted into the
Oocyte Donation Program, the recipient may start taking the medication
necessary for the embryo transfer when her doctor deems it appropriate. The medication involves the
administration of estrogens to make the endometrial lining highly receptive to the embryos.
The medication used for preparing the uterus depends on the presence or absence of ovarian activity in
the recipient. If the patient is not menopausal, her cycle may interfere with the preparation of the
uterus, and a medication (Lupron) is administered to suppress ovarian activity while the
proceeding lasts.
If the patient is menopausal (she has not menstruated for more than a year) there is no ovarian
activity and, thus, the only proceeding is the preparation of the endometrial lining (uterus lining
where the embryos are implanted).
After the donor's follicle aspiration, at least four mature oocytes are set aside (Metaphase
II). Afterwards, on that same day the oocytes are injected, and on the following day the fertilization
is observed.
The embryos are transferred within 48 or 72 hrs. after the aspiration. The program has a strict policy
limiting to two the number of embryos to be transferred to the recipient in each attempt. This decision
seeks to diminish the incidence of multiple pregnancy - which is an undesired outcome in an assisted
fertilization proceeding.
Applying this policy, the program's rate of global clinical pregnancy is close to 50%, based on statistics
of 2004 and 2005, with a triple pregnancy incidence of 0%.
Embryo transfer is a simple proceeding involving no risks, the resulting discomfort is similar to that of
a pap smear, and it lasts 15 minutes approx. Once the transfer has been completed, the patient must rest for
48hrs. Two days prior to the transfer, Micronized Progesterone is administered to the patient, and its
administration continues up to the third month of pregnancy.