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Re: gender selectionFrom: Alan (anonymous@obgyn.net)Mon, 2 Aug 1999 21:19:57 -0500 (CDT)
At Wed, 21 Jan 1998, Nina wrote: > >At Wed, 16 Jul 1997, Laurie wrote: >> >>At Wed, 16 Jul 1997, Thomas wrote: >>> >>>At 10:14 AM 7/16/97 -0500, you wrote: >>>>My husband and I have three girls and will be trying for baby number >>>>four in the next year. We are seriously considering sperm seperation to >>>>try to achieve a boy. Are there any other ways we could >>>>achieve our goal? What do you think of sperm seperation? >>>> >>>If I may add to this, we have two boys and are in the same "boat". We want >>>another baby and would love to have a girl, but either will be great. What >>>about the Shettles Method? >>> >>>Jeff and Beth Harrell >>> >>>Beaching, Fishing, >>>NASCAR Racing and >>>Homeschooling in NC >> >>Our embryologist just reviewed this topic for us at my request. Here >>are some of the studies he discussed: >> >>In a 1970 paper, Shettles claimed that sexual position, female orgasm, >>vaginal pH, depth of penetration, and timing related to ovulation >>affected the sex of the baby. He also reported that morphological >>differences exist between "male" (Y-bearing) and "female" (X-bearing) >>sperm. These findings have not been replicated. There are several >>conflicting studies on timing of ovulation and sex of the baby, and more >>sophisticated microscopic techniques have failed to find morphologic >>differences in the sperm. >> >>Some studies have shown that (a) the use of Clomid and (b) cycles with a >>longer follicular phase (which would be expected in Clomid cycles) have >>a higher incidence of female births. Of course, other studies have >>shown no difference. >> >>Ericcson in 1973 published an albumin separation method reported to >>isolate Y-bearing sperm. He subsequently patented the method and it is >>in commericial use. Several studies have since shown that use of this >>method does not affect the sex ratio. >> >>Flow cytometry, another lab technique which involves staining and then >>sorting the sperm, has been shown to affect the sex ratio. The problems >>with this technique are (1) does the staining affect the subsequent baby >>in any way and (2) sperm recovery is very limited, to the point of >>requiring assisted reproductive techniques such as IVF/ICSI to achieve >>pregnancy. >> >>Pre-implantation biopsy of embryos is also being more widely performed >>(usually to prevent transmission of genetic conditions which affect >>males vs. females), but it has the disadvantages of requiring IVF and >>of risking the loss of the embryo. >> >>So what this boils down to is there's not a reliable, inexpensive method >>for sex selection--and I wonder if that's all bad :-) >> >>-- >>Laurie Lovely, MD >>RE fellow, UNC-Chapel Hill >> >-- >Hello Laurie, > >My husband and I have been doing some research and ran across your comments on the Ericcson 1973 study on albumin separation to isolate Y-bearing sperm. The clinic we have contacted claim hit rates of up to 75% for childs sex preselection. Would you be so kind as to pass on any of the references you mentioned citing poor success rates for this method ? I would like to have the clinic explain/refute those results. Many thanks. > >Nina B. > Nina, My wife and I are considering a 4th child and would like a girl. We have 3 boys. Have you had any success with your clinic? Did they satisfactorily explain their claimed high success rate? Do you know any organizations to contact for information regarding gender preselection?
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