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Use as early as eight weeks in special circumstances has been described. [4] It can be performed in a transcervical or transabdominal manner. [2] Although this procedure is mostly associated with testing for Down syndrome, overall, CVS can detect more than 200 disorders. [5]
In obstetrics, a cephalic presentation or head presentation or head-first presentation is a situation at childbirth where the fetus is in a longitudinal lie and the head enters the pelvis first; the most common form of cephalic presentation is the vertex presentation, where the occiput is the leading part (the part that first enters the birth canal). [1]
External cephalic version (ECV) is a process by which a breech baby can sometimes be turned from buttocks or foot first to head first. It is a manual procedure that is recommended by national guidelines for breech presentation of a pregnancy with a single baby, in order to enable vaginal delivery.
Situational factors include a short umbilical cord and unevenness of the pregnant person's pelvic floor during contractions, leading to the baby's head tipping to one side. [5] Asynclitism can also begin at the time of birth. This happens when the fetus quickly comes down on the pelvic floor before straightening its head when the water breaks. [14]
Although 91% of fetuses affected by Down syndrome exhibit this defect, 5% of fetuses flagged by the test do not have Down syndrome. Ultrasound may also detect fetal organ anomaly. Usually scans for this type of detection are done around 18 to 23 weeks of gestational age (called the " anatomy scan ", "anomaly scan," or "level 2 ultrasound").
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