Do we see more boys then girls born as the result of blastocyst transfers. Check out the new RPMG blog.
By the way, in the future my posts will be at the RPMG blog.
Arthur L. Wisot, M. D.
Showing posts with label sex ratio. Show all posts
Showing posts with label sex ratio. Show all posts
Monday, October 26, 2009
Wednesday, June 24, 2009
Sex Ratio/Identical Twins in Blastocyst Transfer
WFWW-Sex Ratio and Identical Twinning in Blastocyst Transfer
One of the most frequent questions I am asked is whether IVF treatment, and blastocyst transfer in particular, increase the number of offspring of one sex.
According to a compilation of four studies published in the June 2009 issue of Fertility & Sterility, a higher male-female ratio after Day 5 blastocyst transfer compared with Day 3 cleavage-stage ET was 1.29:1 in favor of male offspring. This is not high enough to recommend this as a sex selection technique, but will be somewhat reassuring to those wanting a male child.
The study also looked at the chance of identical twins (monoztgotic twinning-MZT) in Day 5 transfers which has been said to be increased over Day 3 transfers or natural conception. They reviewed the results of nine studies incorporating almost 41,000 cycles and found the risk of MZT after blastocyst transfer was significantly higher compared with cleavage-stage transfer by a factor of 3.04:1. MZT is not a desirable result as it can create a more risky pregnancy for the babies, especially if they are in the same amniotic sac.
One of the most frequent questions I am asked is whether IVF treatment, and blastocyst transfer in particular, increase the number of offspring of one sex.
According to a compilation of four studies published in the June 2009 issue of Fertility & Sterility, a higher male-female ratio after Day 5 blastocyst transfer compared with Day 3 cleavage-stage ET was 1.29:1 in favor of male offspring. This is not high enough to recommend this as a sex selection technique, but will be somewhat reassuring to those wanting a male child.
The study also looked at the chance of identical twins (monoztgotic twinning-MZT) in Day 5 transfers which has been said to be increased over Day 3 transfers or natural conception. They reviewed the results of nine studies incorporating almost 41,000 cycles and found the risk of MZT after blastocyst transfer was significantly higher compared with cleavage-stage transfer by a factor of 3.04:1. MZT is not a desirable result as it can create a more risky pregnancy for the babies, especially if they are in the same amniotic sac.
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