The second screening in pregnancy
Pregnancy And Childbirth / / August 12, 2017
features screening in pregnancy
second screening during pregnancy is of great informational value for physicians as it allows to reveal many abnormalities in the child's development, not only chromosomal abnormalities, and anatomical.Many defects are visible on ultrasound.But in order to obtain reliable results, it is necessary to sustain the correct timing of the second screening in pregnancy and make the correct calculation of risks.
To get the full picture, you need to start with a survey of about 12 weeks of pregnancy, when a woman is carried ultrasound and blood examined at two biochemical parameters.This is the first screening in pregnancy, doctors call it very sensitive.But even his good results - that is no reason to refuse the blood examination at 16-18 weeks, and ultrasound at 20 weeks.This is especially true of couples in which there are hereditary diseases, if the age of the women over 35 years and so on.
Screening of the second trimester of pregnancy begins with a blood test for 3 or 4biochemical indicator.This is sure to AFP, hCG and ekstriol-A.But these figures, more precisely, their results alone do not tell the whole story.As it does not judge the risk.Therefore, when there is a second screening in pregnancy performance standards for pregnant women does not necessarily know.It calculates the risk of a special program.A decision on further action helps to take a geneticist, if the risk of birth defects of the above population norms.
If a second biochemical screening in pregnancy rate, the expectant mother can calmly wait for ultrasound, which is carried out at 20-22 weeks.In this period all the limbs and organs of the fetus is already well seen, and the doctor can with certainty say - whether the child is healthy and if he had a congenital malformation.The second ultrasound screening in pregnancy allows the doctor to see problems with the kidneys, gastrointestinal tract fetal kidneys.If the problem is serious, but it is not a valid reason for termination of pregnancy, you need to consider tactics and treatment of birth after birth.Perhaps to find good medical specialists who will be able to conduct an operation newborn.Also on this ultrasound the doctor can diagnose severe pathology such as a lack of the brain of the child - is a reason to terminate the pregnancy, as the baby is not viable.
biochemical screening in pregnancy to help identify women who have a high risk of having a defective or non-viable child.US gives more complete picture.But almost always to confirm the diagnosis requires invasive diagnostics - amniocentesis or cordocentesis, allowing learn karyotype fetus.The first procedure is considered safer and much less likely to lead to miscarriages.
However, the decision on whether to carry out invasive diagnostics and interrupt the pregnancy if the child has found severe malformations or genetic abnormalities, remains for future parents.