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"Late-term" is not a medical term, but rather is a layman's term to try to describe a pregnancy that has advanced very close to or beyond fetal viability (usually near the beginning of the third trimester/about 25 weeks given current medical technology). But determining medical viability for a fetus essentially means that if the fetus were born at that moment, the fetus would be able to survive outside the womb and meets certain medical criteria pre-natally that assures the obstetrician that survival is possible. Gestational age is not the sole indicator of fetal viability....
For a developmentally normal fetus, between 23-24 weeks is considered the basal standard to attempt delivery and resuscitation of an endangered neonate. An ultrasound exam can give a good idea of fetal maturity as related to gestational age in emergencies, and the OB can use their medical knowledge to decide the best course of treatment from there. But factors such as lung development, overall organ development, prior maternal health, and previously known fetal health issues (if any) also play a large part in determining if a pregnancy can be considered to be hosting a viable fetus.
For fetuses with genetic or significant physical disorders, their overall development may have been affected by their particular health issue. For instance, a fetus with a severe spinal lesion due to spina bifida may not be considered viable even at 38 weeks because the lesion has caused a complete retraction of the brain and brain stem into the spinal canal and has severely damaged basal life functions governed by the brain stem (I knew someone this happened to). Or, a fetus may present at 24 weeks with a complete omphalocele (most internal organs develop outside the abdomen - heart, intestines, liver, etc.), which is a very dangerous condition and usually renders a fetus non-viable at any stage in the pregnancy (I also knew someone else whose baby had this disorder - it's why I think Gulf-War syndrome is very real). There are many other issues that may impede fetal development to the point that viability is also effected.
But within the context of the general abortion debate, the phrase "late-term" abortion tends to be used in regards to a viable or third trimester abortion. Those are rare to the point of existing in statistical insignificance. Surgical abortions past the point of established fetal viability are illegal in all 50 states of the USA, not to mention are so medically risky that they are also medically unethical as they present greater medical risks to maternal health than an induced labor and delivery when absent an unusual maternal health issue (like a bleeding disorder, diagnosed placenta accreta, etc.).
Now, I have heard used (again within the general context of an abortion debate) the term "a later abortion" used to describe a second trimester abortion since it is a conventional surgical abortion that is performed *later* than the first trimester. These surgical abortions do require different surgical techniques from a first trimester suction catheter abortion, as they require greater dilation of the uterine cervix and more invasive surgical instruments to remove the fetus and products of conception. They are also more expensive, are performed at far fewer clinics than are first trimester abortions, and cannot be performed after 26 weeks for medical safety reasons. Some clinics even require a referral from a licensed OB to establish medical cause for the abortion to be performed...
As to what I think the anti-choice side refers to a "late term abortion", I've seen that term usually used by anti-choicers in reference to any abortion performed beyond the first trimester (starting at 14 weeks). Not sure why the viability standard alone isn't their cut off point since the fetus does not generally survive before 24 weeks, but that has been what I've mostly read opined within abortion debates/discussions...
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