![]() ![]() What that means, the story goes, is that couples can try having sex to conceive two to three days before the woman is scheduled to ovulate. The thinking is that it might up the chances for the girl X-sperm to be the ones still waiting around in the fallopian tubes by the time the egg drops in a few days later. The theory behind the Shettles Method is that girl-producing sperm (called X-sperm) move more slowly but are more resilient and live longer than male-producing sperm (aka Y-sperm), which are faster but have shorter life spans. Though there is no medical data whatsoever to back up the efficacy of the so-called Shettles Method, some couples swear by it and others decide to give it a try. Sperm sorting is less reliable than gender selection with PDG, which is nearly 100 percent accurate in selecting the desired sex. The sperm of the desired sex is either inserted into the mom-to-be’s uterus via intrauterine insemination (IUI) or used to fertilize an egg in vitro. Girl-producing sperm contains about 3 percent more DNA than boys', and when stained with a special fluorescent material in the lab, appears to shine brighter. Sperm sorting, also known as the MicroSort Method, is done using flow cytometry, in which the girl-producing sperm (X-sperm) is separated from boy-producing sperm (Y-sperm). Other fertility clinics will let parents choose the sex of their baby if they've already had one or more children of the same sex - a term called "family balancing." PGS counts the number of chromosomes and tests for chromosomal abnormalities. PGD is part of preimplantation genetic testing (PGT), which also includes something called preimplantation genetic screening (PGS). (Some genetic disorders, for example, are specifically linked to sex, such as Duchenne muscular dystrophy (DMD), which mostly occurs in boys.) This method was developed to help couples who have gone through genetic testing and know they are carriers of serious genetic disorders - and most fertility centers and medical organizations discourage it if there is no real medical reason to select baby's sex. That said, using PGD to choose your child's sex is controversial (not to mention costly). Only embryos of the desired sex can be implanted in the mother's uterus. With preimplantation genetic diagnosis (PGD), used in conjunction with in-vitro fertilization (IVF), doctors can extract one cell from the rapidly dividing embryo fertilized in the petri dish and examine it to determine sex. If you’re getting an assist from science to conceive in the first place, you may be able to pick the sex of your baby. Here's what you should know about gender selection techniques - including the high-tech, the low-tech and the no-tech options! Preimplantation genetic diagnosis
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