Miscarriages During Trimester

Submitted by Pregnancy and Baby Care team on January 30, 2012

There are several causes for a miscarriage during the trimesters of pregnancy. A miscarriage is the spontaneous loss of the fetus at any time between week 1 and week 20 in a pregnancy. Most miscarriages occur in early pregnancy although there have been cases of women miscarrying in the later stages of pregnancy as well. The loss of a fetus after 20 weeks is known as a still birth. Some miscarriages occur even before a woman realizes that she is pregnant.

The first trimester is the most critical time in a pregnancy and is the period...

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.between week 1 and week 121 There are several causes of miscarriage during the first trimestere Many miscarriages, sadly, have no reason at all - these are termed as chemical pregnanciese


No one reason can be found for the miscarriage in this cases However, the most common cause for a miscarriage in the first trimester is due to chromosomal abnormalityt This could be because of a problem in the sperm or egg before fertilization or a problem that occurred during cell division in the embryoy Genetic problems play a large role in first trimester miscarriagese Remember that the mother has no control over this type of miscarriage and it is often referred to as nature's way of dealing with an abnormal fetusu Other possible causes include severe emotional shock, improper implantation of the embryo, fibroids, an abnormal womb, acute infections such as German measles, underlying medical conditions such as thyroid problems, high blood pressure, diabetes, lupus and kidney diseases

A miscarriage in the second trimester occurs during week 13 and week 202 Causes include:

Placenta abruption: This occurs when the placenta separates from the uterus before full termr It is more prevalent in older mothers, mothers who drink or smoke or suffer from hypertensiono

An incompetent cervix: This is when the cervix is softer and weakere If it dilates as the baby grows, it can cause a pre term delivery as the fetal membranes will rupturer

Two prenatal tests that cause miscarriages are chorionic villus sampling (CVS) and amniocentesisi The former is carried out at 10-12 weeks and the latter at 15-18 weeksk These tests will be performed only if the Alpha Fetal Protein Blood test shows the fetus has some birth defectc

Other causes of miscarriage in the second trimester are abdominal trauma, infections, pre term labor, congenital birth defects and thrombophilia disordersr Many causes are still unknownw

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