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- Newsgroups: talk.abortion
- Path: sparky!uunet!mnemosyne.cs.du.edu!nyx!mcochran
- From: mcochran@nyx.cs.du.edu (Mark A. Cochran)
- Subject: Re: Darcy and viability as important dividing line.
- Message-ID: <1993Jan6.051423.13707@mnemosyne.cs.du.edu>
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- References: <C041BC.GtD@news.cso.uiuc.edu> <1993Jan1.042143.28771@mnemosyne.cs.du.edu> <1993Jan6.023940.23790@rotag.mi.org>
- Date: Wed, 6 Jan 93 05:14:23 GMT
- Lines: 44
-
- In article <1993Jan6.023940.23790@rotag.mi.org> kevin@rotag.mi.org (Kevin Darcy) writes:
- >In article <1993Jan1.042143.28771@mnemosyne.cs.du.edu> mcochran@nyx.cs.du.edu (Mark A. Cochran) writes:
- >>In article <C041BC.GtD@news.cso.uiuc.edu> parker@ehsn17.cen.uiuc.edu (Robert S. Parker) writes:
- >>
- >>>"viability" is medically defined (roughly) as the point after which a
- >>>developing fetus could survive outside the womb. It may also require that
- >>>the fetus could continue to grow "normally" although special care and treatment
- >>>may be needed. It is generally considered to be sometime around the start of
- >>>the third trimester (I think). It is not an exact time, it is a general range
- >>>in which it is usually found to occur in those born prematurely. (They look at
- >>>children born prematurely at various times and compare the development at birth
- >>>to the statistical survival rates to come up with an average figure.)
- >>>
- >>In practice, 26 weeks is considered to be resonably viable.
- >
- >OK, I'll go with that then.
- >
- >Do I hear Galen still whining?
- >
- Not as long as you accept too that 26 is just a quidline, and may well
- be totally off base in many situations. That's the real problem with
- providing a definition of viability Kevin, it's *extremely*
- situational. I *wish* we could say "all 26 week fetuses will survive"
- or even that they have a 50% chance of survival. We can't. All we can
- say is *if* this, and *if* that, *then* the 26 weeker has a pretty
- good chance at survival.
- It's just not an exact science.
- For that matter, determining the gestational age of a fetus isn't
- exact either. It is not at all uncommon to have a neonate assessed by
- 2-3 different people, and get gestational age estimates that are 2-3
- weeks different. There's too many variables for it to be exact.
- Consider just one thing that is used to determine gestational age. The
- separation or fusing of the eyelids. If the eyelids are still
- completly fused, we can say it is probably no more then 26 weeks
- gestational, *if* we don't look at any other factors. And what if the
- eyelids are *partly* fused?
- Do you begin to see why it's immosible to have a truely exact
- definition?
-
- --
- Mark Cochran merlin@eddie.ee.vt.edu
- These are the views of my employer, your employer, your government, the
- Church of your choice, and the Ghost of Elvis. So there.
- Member, T.S.A.K.C.
-