what does the fetal fraction mean?
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Fetal fraction describes the proportion of the total cfDNA that is fetal in origin. The 'fetal' component is actually derived from placental trophoblast (2, 3). Thus, cfDNA analysis (NIPT) for fetal trisomy can be considered a 'liquid biopsy' of the placenta.
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Fetal ultrasound scan of the third trimester. During the third trimester of pregnancy the fetal ultrasound scan is performed with the help of the abdominal sensor within pregnancy weeks 34-36. At this stage of pregnancy the fetus has all vital organs fully developed and the period of fast growth and maturity continues.
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FETAL ATTITUDE. The fetal attitude describes the position of the parts of your baby's body. The normal fetal attitude is commonly called the fetal position. The head is tucked down to the chest. The arms and legs are drawn in towards the center of the chest.
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Wellbeing Scan. The fetal wellbeing scan will check the wellbeing of your baby. This is done by assessing the size of the baby and the amniotic fluid volume around the baby. The scan will give you an estimated weight for your baby.
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What is nonreassuring fetal status? Nonreassuring fetal status (NRFS) is a term that may be used to describe a baby's health late in the pregnancy or during labor. It is used when test results suggest that the baby may not be getting enough oxygen.
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Your health care provider might use fetal ultrasound to: Confirm the pregnancy and its location. Some fetuses develop outside of the uterus, in the fallopian tube. A fetal ultrasound can help your health care provider detect a pregnancy outside of the uterus (ectopic pregnancy).
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Nuchal translucency (NT) is the normal fluid-filled subcutaneous space between the back of the fetal skin and the overlying skin.[1] NT is visible and can be measured by ultrasonographic imaging between 11 weeks and 14 weeks gestation.[2] Increased NT is associated with different fetal chromosomal and nonchromosomal ...
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The fetal pole is a thickening on the margin of the yolk sac of a fetus during pregnancy. It is usually identified at six weeks with vaginal ultrasound and at six and a half weeks with abdominal ultrasound. However it is quite normal for the fetal pole to not be visible until about 9 weeks.
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A fetal Doppler test normally takes place during your second trimester (weeks 13 to 28 of pregnancy). Some manufacturers of at-home fetal Dopplers say you may be able to hear your baby's heartbeat as early as 8-12 weeks of pregnancy.
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While gestational age is measured from the first day of your last menstrual period, fetal age is calculated from the date of conception. This is during ovulation, which means that fetal age is about two weeks behind gestational age.
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FETAL GROWTH PARAMETERS. The fetal body parts most frequently used to evaluate growth include biparietal diameter (BPD), head circumference (HC), abdominal circumference (AC), humerus length (HL), and femur length (FL).
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Your healthcare provider may do fetal heart monitoring during late pregnancy and labor. The average fetal heart rate is between 110 and 160 beats per minute. It can vary by 5 to 25 beats per minute. The fetal heart rate may change as your baby responds to conditions in your uterus.
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10 in the Journal of the American Medical Association finds that after seven weeks into a pregnancy, tests that analyze mom's blood for fetal DNA can correctly identify a male fetus 95.4 percent of the time and a female fetus 98.6 percent of the time on average.
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What Does It Mean If Your Belly Measures Ahead During Pregnancy? Two Midwives Explain. ... "It means one of several things: You are growing a perfectly sized baby, your baby is growing large, your amniotic fluid level may be high, or the ultrasound measurement may be off upwards of 15 percent."
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FHHR. This stands for 'fetal heart heard regular', which means that the midwife or doctor has heard your baby's heart.
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Abdominal circumference (AC) is one of the basic biometric parameters used to assess fetal size. AC together with biparietal diameter, head circumference, and femur length are computed to produce an estimate of fetal weight.
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Introduction. Under some circumstances, the physician may recommend one of several tests which can assess fetal health (fetal well-being) during the pregnancy. These tests are designed to evaluate the status of the afterbirth (placenta) and whether or not oxygen and nutrition transferred to the fetus are being affected ...