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Identifying the cause of the miscarriage may help prevent future pregnancy loss, especially in cases of recurrent miscarriage. Often there is little a person can do to prevent a miscarriage. [ 11 ] Vitamin supplementation before or during pregnancy has not been found to affect the risk of miscarriage. [ 119 ]
Chorionic hematoma is the pooling of blood between the chorion, a membrane surrounding the embryo, and the uterine wall. [2] It occurs in about 3.1% of all pregnancies, [2] it is the most common sonographic abnormality and the most common cause of first trimester bleeding. [3]
It is estimated that less than 1ml of fetal blood is lost to the maternal circulation during normal labour in around 96% of normal deliveries. [ 1 ] [ 2 ] The loss of this small amount of blood may however be a sensitising event and stimulate antibody production to the foetal red blood cells, an example of which is Rhesus disease of the newborn.
Obstetric causes of first trimester bleeding include the following: Early pregnancy loss is a term often used interchangeably with spontaneous abortion and miscarriage and refers to pregnancy loss during the first trimester. [7] It is the most common cause of early pregnancy bleeding and is associated only with heavy (versus light) bleeding. [8]
In anembryonic pregnancy, levels of the pregnancy hormone human chorionic gonadotropin (hCG) typically rise for a time, which can cause positive pregnancy test results and pregnancy symptoms such as tender breasts. [2] [7] Because of the presence of hCG, an ultrasound is typically necessary to diagnose an anembryonic pregnancy. [3]
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According to their reporting, her doctors told her it would be a “crime” to treat her until the fetus’ heart stopped beating, ultimately delaying her care and causing her death.
Besides placenta previa and placental abruption, uterine rupture can occur, which is a very serious condition leading to internal or external bleeding. Bleeding from the fetus is rare, but may occur with two conditions called vasa previa and velamentous umbilical cord insertion where the fetal blood vessels lie near the placental insertion site unprotected by Wharton's jelly of the cord. [11]