![]() In most cases, the abnormalities of chromosomes that caused a miscarriage do not reflect any abnormality in either parent. ![]() Genes, in turn provide the instructions for the proteins and other molecules that create, shape and govern our bodies and health. Chromosomes are long strings of DNA, each containing thousands of genes. Problems with fetal chromosomes account for approximately 50% of all miscarriages. The term "stillbirth" is generally used when a fetus is delivered beyond 20 weeks but is not living. If a pregnancy ends after 20 weeks, it is usually not labeled a miscarriage even though it is a pregnancy loss. Blighted ovum or an embryonic gestation - This occurs when a gestational sac forms inside the uterus, but no fetus is present after seven weeks.Recurrent miscarriage - A woman is said to have recurrent miscarriage after three or more miscarriages in a row. ![]() However, neither the fetus nor the placenta has been expelled from the uterus. ![]() This means no heart beat is present when either a heartbeat has been noted before or when the fetus is of a size in which a heartbeat would always be expected in a healthy pregnancy.
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