Miscarriage or spontaneous abortion is the spontaneous end of a pregnancy at a stage where the embryo or fetus is incapable of surviving, generally defined in humans at prior to 20 weeks of gestation. Miscarriage is the most common complication of early pregnancy.
Terminology
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Can a Cold or Flu Cause Miscarriage? CDC Guidelines on H1N1 and Pregnancy. Swine Flu Symptoms ... Recent Blog Posts. Swine Flu and Risk of Miscarriage ...miscarriage.about.com/b/The Miscarriage Blog
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... wrote yesterday (2.27) on my everyday blog that I was having one of " ... Diary of a Miscarriage. Blog Archive. May 2008 (1) March 2008 (1) February 2008 (4) ...miscarriagejournal.blogspot.com/Miscarriage or spontaneous abortion is the spontaneous end of a pregnancy at a stage where the embryo or fetus is incapable of surviving, generally defined in humans at prior to 20 weeks of gestation. Miscarriage is the most common complication of early pregnancy.
Terminology
Very early miscarriages - those which occur before the sixth week LMP (since the woman's Last Menstrual Period) are medically termed early pregnancy loss or chemical pregnancy.
In medical contexts, the word "abortion" refers to any process by which a pregnancy ends with the death and removal or expulsion of the fetus, regardless of whether it is spontaneous or intentionally induced. Many women who have had miscarriages, however, object to the term "abortion" in connection with their experience, as it is generally associated with induced abortions. In recent years there has been discussion in the medical community about avoiding the use of this term in favor of the less ambiguous term "miscarriage."
Labour resulting in live birth before the 37th week of pregnancy is termed "premature birth," even if the infant dies shortly afterward. The limit of viability at which 50% of fetus/infants survive longterm is around 24 weeks, with moderate or major neurological disability dropping to 50% only by 26 weeks. - in particular see TABLE 1 Survival and Neurologic Disability Rates Among Extremely Premature Infants Although long-term survival has never been reported for infants born from pregnancy shorter than 21 weeks and 5 days, infants born as early as the 16th week of pregnancy may sometimes live for some minutes after birth.
A fetus that dies while in the uterus after about the 20-24th week of pregnancy is termed a "stillbirth"; the precise gestational age definition varies by country. Premature births or stillbirths are not generally considered miscarriages, though usage of the terms and causes of these events may overlap.

Forms and types
The clinical presentation of a threatened abortion describes any bleeding seen during pregnancy prior to viability, that has yet to be assessed further. At investigation it may be found that the fetus remains viable and the pregnancy continues without further problems. It has been suggested that bed rest improves the chances of the pregnancy continuing when a small subchorionic hematoma has been found on ultrasound scans.
Alternatively the following terms are used to describe pregnancies that do not continue:
























