Zygotes which fail to attach to uterus

[Jerseydevil]

Hey everyone, I'm currently working on a college paper and I need to know what the percentage is of zygotes that fail to attach to the uterus, and are naturally aborted.

 

I've been looking around the web and most things have said around 65%-70% which my gut tells me is a little high. Also one place said 18%.

 

If anyone knows the correct percentage please let me know. Also if you could, it would be helpful if you linked me to a credible site that has this information and that I can site on my paper.

 

Thanks in advance

[Daecon]

The only way you could even begin to approximate an estimate would be to tally up the number of times a woman has (unprotected) sex without getting pregnant.

 

Then just guess how many of those occasions didn't actually result in any oval fertilization, and discount that number.

 

Then you'd have a total of how how many times fertilization lead to full-term pregnancy, and how many times it didn't.

 

It's still complete guesswork as to how many times fertilization actually occurred, though. You can try to estimate depending on menstrual cycle, but that isn't foolproof.

[iNow]

That's correct. Asking the question the way you have, you have next to nil ability to know the proper denominator in your equation. At best, you can say how many were reported, and it's pretty tough to draw conclusions from that.

[Jerseydevil]

wow, I should have thought a little bit more before I asked the question

 

This is still something I would like to work into my paper tho, so thx for your help fellas

[iNow]

I'm sure you've done a lot of thought already. It's just sometimes easier when you ask a question to someone not already buried in all of the other "sub-topics" of the presentation.

 

 

This is a good place to ask questions. Hopefully you'll hang around and ask more, and maybe... in the process... answer a few from others.

 

 

Good luck with the paper, and go Rangers!

[Daecon]

There could also be environmental factors at work, which affect the probability of a fertilized zygote attaching to the uterine wall, such as stress levels or health/nutrition.