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Obstetric ultrasonography, or prenatal ultrasound, is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in the uterus (womb).
Prenatal care in the United States is a health care preventive care protocol recommended to women with the goal to provide regular check-ups that allow obstetricians-gynecologists, family medicine physicians, or midwives to detect, treat and prevent potential health problems throughout the course of pregnancy while promoting healthy lifestyles that benefit both mother and child. [1]
Around weeks 11–13, nuchal translucency scan (NT) may be offered which can be combined with blood tests for PAPP-A and beta-hCG, two serum markers that correlate with chromosomal abnormalities, in what is called the First Trimester Combined Test. The results of the blood test are then combined with the NT ultrasound measurements, maternal age ...
In the third trimester the midwife will see the mother every two weeks until week 36 and every week after that. Weight, blood pressure, and abdominal measurements will continue to be done. Lab tests such as a CBC and UA may be done with additional testing done for at-risk pregnancies.
Transabdominal chorionic villus sampling is an alternative to amniocentesis if genetic diagnostic testing is to be performed in the first trimester between ten and 15 weeks' gestation. [3] It is important to note that prenatal genetic testing cannot identify all possible fetal genetic abnormalities or their outcomes. [5]
The chance of survival at 22 weeks is about 6%, while at 23 weeks it is 26%, 24 weeks 55% and 25 weeks about 72% as of 2016. [189] With extensive treatment up to 30% of those who survive birth at 22 weeks survive longer term as of 2019. [ 190 ]
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When an echogenic intracardiac focus is identified in an otherwise normal second trimester fetus, a normal cell-free DNA test can be very reassuring and obviate the need for invasive testing. Amniocentesis is a test to check a baby's chromosomes. A small amount of amniotic fluid, which contains some fetal cells, is removed and tested.