OB Chapter 9 Assessing the Fetus(Correct answers)
Alpha-fetoprotein (AFP) correct answers fetal substance used to screen for specific abnormalities
amniocentesis correct answers withdrawing amniotic fluid for laboratory examination
chronic villous sampling correct answers procedure to obtain tissue from the fetal side of the
developing placenta
hydramnios correct answers more amniotic fluid than normal
multiple marker screening correct answers alpha-fetoprotein, human chorionic gonadotropin,
unconjugated estriol, inhibin A
oligohydraminos correct answers Less amniotic fluid than normal
percutaneous umbilical blood sampling correct answers Sampling fetal blood using ultrasound
ultrasonography correct answers imaging technique that uses high-frequency sound waves to
visualize internal body structures
Confirm pregnancy and its location, gestational age, whether pregnancy is multifetal; confirm
fetal viability; adjunct to chorionic villous sampling; identify fetal markers that suggest major
anomalies correct answers reason for examination during the first trimester
Confirm fetal viability, gestational age, and growth; locate placenta; determine fetal presentation
and anatomy; evaluate amniotic fluid volume and fetal movement; adjunct to amniocentesis and
percutaneous umbilical blood sampling; evaluate umbilical cord correct answers reason for
examination during the second trimester
Transabdominal; because elevates the uterus and displaced the gas-filled intestines if needed;
may cause discomfort in bladder area when scanned. correct answers which ultrasound is a full
bladder needed
Accurate gestational age is needed for best maternal serum alpha-fetoprotein evaluation, to
identify intrauterine growth restriction, or if there is a question about the expected date of birth.
It is most accurately assessed during the first trimester by measuring the crown-rump length.
During the last half of pregnancy, gestational age is assessed by several measurements, and
abdominal circumference. From 24 to 32 weeks of gestation, two or three serial ultrasound
measure taken 2 weeks apart can better establish gestational age when compared with standard
fetal growth curves. correct answers gestational age
Low levels of AFP suggest chromosomal trisomies such as trisomy 21, gestational trophoblastic
disease, a normal fetus with overestimation of gestational age or increased maternal
weight. correct answers low alpha-fetoprotein level
Alpha-fetoprotein (AFP) correct answers fetal substance used to screen for specific abnormalities
amniocentesis correct answers withdrawing amniotic fluid for laboratory examination
chronic villous sampling correct answers procedure to obtain tissue from the fetal side of the
developing placenta
hydramnios correct answers more amniotic fluid than normal
multiple marker screening correct answers alpha-fetoprotein, human chorionic gonadotropin,
unconjugated estriol, inhibin A
oligohydraminos correct answers Less amniotic fluid than normal
percutaneous umbilical blood sampling correct answers Sampling fetal blood using ultrasound
ultrasonography correct answers imaging technique that uses high-frequency sound waves to
visualize internal body structures
Confirm pregnancy and its location, gestational age, whether pregnancy is multifetal; confirm
fetal viability; adjunct to chorionic villous sampling; identify fetal markers that suggest major
anomalies correct answers reason for examination during the first trimester
Confirm fetal viability, gestational age, and growth; locate placenta; determine fetal presentation
and anatomy; evaluate amniotic fluid volume and fetal movement; adjunct to amniocentesis and
percutaneous umbilical blood sampling; evaluate umbilical cord correct answers reason for
examination during the second trimester
Transabdominal; because elevates the uterus and displaced the gas-filled intestines if needed;
may cause discomfort in bladder area when scanned. correct answers which ultrasound is a full
bladder needed
Accurate gestational age is needed for best maternal serum alpha-fetoprotein evaluation, to
identify intrauterine growth restriction, or if there is a question about the expected date of birth.
It is most accurately assessed during the first trimester by measuring the crown-rump length.
During the last half of pregnancy, gestational age is assessed by several measurements, and
abdominal circumference. From 24 to 32 weeks of gestation, two or three serial ultrasound
measure taken 2 weeks apart can better establish gestational age when compared with standard
fetal growth curves. correct answers gestational age
Low levels of AFP suggest chromosomal trisomies such as trisomy 21, gestational trophoblastic
disease, a normal fetus with overestimation of gestational age or increased maternal
weight. correct answers low alpha-fetoprotein level
