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The sex of the fetus may be discerned by ultrasound as early as 11 weeks' gestation. The accuracy is relatively imprecise when attempted early. [15] [16] [17] After 13 weeks' gestation, a high accuracy of between 99% and 100% is possible if the fetus does not display intersex external characteristics. [18]
Cardiotocography sound Schematic explanation of cardiotocography: heart rate (A) is calculated from fetal heart motion determined by ultrasound, and uterine contractions are measured by a tocodynamometer (B). These numbers are represented on a time scale with the help of a running piece of paper, producing a graphical representation.
Funic souffle (also known as funicular or fetal souffle), is a blowing sound heard in synch with fetal heart sounds, and may originate from the umbilical cord. It has also been described as a sharp, whistling sound that is synchronous with the pulse of the foetus, usually heard during the second trimester of pregnancy (13–28 weeks). [3]
An opened oviduct with an ectopic pregnancy at about seven weeks' gestational age [73] The rate of ectopic pregnancy is about 1% and 2% of that of live births in developed countries, though it is as high as 4% in pregnancies involving assisted reproductive technology. [5] Between 93% and 97% of ectopic pregnancies are located in a fallopian ...
Progesterone causes many changes to the genitourinary system. A pregnant woman may experience an increase in the size of the kidneys and ureter due to the increase blood volume and vasculature. Later in pregnancy, the woman might develop physiological hydronephrosis and hydroureter, which are normal. [33]
Crown–rump length of less than 7 mm and no heartbeat. [110] [111] Mean gestational sac diameter of at least 25 mm and no embryo. Mean gestational sac diameter of 16–24 mm and no embryo. [110] [111] Absence of embryo with heartbeat at least 2 weeks after an ultrasound scan that showed a gestational sac without a yolk sac.
A normal nonstress test will show a baseline fetal heart rate between 110 and 160 beats per minute with moderate variability (5- to 25-interbeat variability) and 2 qualifying accelerations in 20 minutes with no decelerations. "Reactive" is defined as the presence of two or more fetal heart rate accelerations within a 20-minute period. Each ...
Use of ultrasound to measure the size of the fetus in the womb is controversial, as these methods are often inaccurate and may lead to unnecessary caesarian section; a trial of labour is often recommended even if size of the fetus is estimated to be large. [2] Theoretically, pelvimetry may identify cephalo-pelvic disproportion. However, a woman ...
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