Gender Selection at Bay IVF
Bay IVF - Advanced Reproductive Care                                Palo Alto  650-322-0500


Gender Selection

We were one of the first San Francisco Bay Area fertility clinics to offer Gender Selection.

This treatment uses Pre-Implantation Genetic Testing (PGT) procedure to identify the gender of each embryo. With this method, the prospective parents will know the gender of each embryo with 100% accuracy prior to their transfer into the uterus.

The Gender Selection procedure requires the creation of embryos and therefore is an extension of In Vitro Fertilization. Please see the In Vitro Fertilization procedure for the process of creating the embryos.

Since most human eggs and sperm and thus most human embryos are not biologically perfect, for most couples, the probability of a successful outcome of Gender Selection is typically less than 50% even if two embryos are transferred inside the uterus.

The following table shows the nationwide probability of IVF/Gender Selection success. Your actual probability may be higher or lower.

Latest Nationwide Probability of Success
Female Age 34 & Younger 35 - 37 38 - 40 41 - 42 43 & Older
Probability of Success (%) 39 30 19 9 3
Average Number of Embryos Transferred 1.3 1.4 1.6 1.9 2.3


Gender Selection Procedure
Gender Selection is a complex treatment consisting of the following steps:

  1. In Vitro Fertilization to create embryos
  2. Extended embryo culture to blastocyst

    By the fifth to seventh day after the egg retrieval, the embryos should reach the blastocyst stage (80 or more cells).

  3. Blastocyst trophectoderm biopsy

    An embryo biopsy is performed by creating an opening in the eggshell around the embryo. It is possible to safely remove two to three cells through this opening using a special microscope with micromanipulators. The cells are taken from the trophectoderm only (future placenta cells, genetically identical to embryonic cells). The “inner mass” cells (embryonic cells) are not removed.


    Blastocyst PGT


    So far, there is no evidence that embryonic biopsy results in an increased chance of abnormalities in the baby or that the risk of birth defects is higher when compared to conceptions that occur spontaneously without medical assistance (2% to 5%).

  4. Blastocyst vitrification (cryopreservation)

    Since it takes several days to carry out the embryo genetic analysis, the blastocysts are cryopreserved immediately after their biopsy and stored in liquid nitrogen in our IVF laboratory.

  5. Genetic analysis of the embryonic tissue

    The genetic analysis will determine the gender of each embryo, and it also checks for many of the most common genetic conditions. We will contact you as soon as the results are available (approximately one week).

  6. Liquid nitrogen storage of the cryopreserved embryos

    Vitrified embryos can be stored for extended periods of time, but most Gender Selection patients will start an embryo transfer cycle with the onset of the first menstrual period after their IVF treatment.

  7. Subsequent Frozen Embryo Transfer

    The endometrial lining is first stimulated, followed by the thawing of one or two embryos of the desired gender and then transferring them inside the uterus.

Please use the following links for financial information about Gender Selection and to schedule a consultation.


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with Dr. Polansky


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