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Prenatal testing is a tool that can be used to detect some birth defects at various stages prior to birth. Prenatal testing consists of prenatal screening and prenatal diagnosis, which are aspects of prenatal care that focus on detecting problems with the pregnancy as early as possible. [1]
Some abnormalities detected by ultrasound can be addressed by medical treatment in utero or by perinatal care, though indications of other abnormalities can lead to a decision regarding abortion. Perhaps the most common such test uses a measurement of the nuchal translucency thickness ("NT-test", or " Nuchal Scan ").
A pregnancy test detects the presence of the pregnancy hormone human chorionic gonadotropin in a person’s body. The body doesn’t produce that hormone until several days after conception.
The assays used to detect the presence of hCG in blood or urine are generally reliable and inexpensive. Secretion of hCG can occur as soon as 6 days following ovulation and on average 8–10 days following ovulation; this is the earliest hCG can be detected in a blood sample. [7] [5] [8] The hCG concentration in blood is higher than in urine ...
Signs and symptoms of pregnancy are common, benign conditions that result from the changes to the body that occur during pregnancy. Signs and symptoms of pregnancy typically change as pregnancy progresses, although several symptoms may be present throughout. Depending on severity, common symptoms in pregnancy can develop into complications. [1]
Most of the changes are due to pregnancy hormones. Researchers from the University of California – Santa Barbara for the first time show how hormonal shifts alter the brain throughout pregnancy ...
Another test that may be performed is a chromosomal microarray, which can detect chromosomal imbalances, such as small- and large-scale deletions and duplications. [8] Chromosomal microarray can be performed on cultured or uncultured fetal tissue, with results available as early as 3 days. [5]
Researchers said the findings, based on brain scans from one mother, may represent one of the first comprehensive maps of changes in the organ before, during and after human pregnancy.