OB GYN ARDMS REGISTRY REVIEW TIPS QUESTIONS
AND ANSWERS SET A+
✔✔Lateral Ventricular Atria - ✔✔In ruling out hydrocephalus, where would one 1st
begin to see enlargement?
✔✔1cm in largest dimension transversely - ✔✔The normal measurements for the lateral
ventricla of the fetal brain are?
✔✔3 ossidication centers (2 posterior pointing toward each other, 1 anterior) - ✔✔When
the fetal spine is imaged transversly, the ultrasound demonstrates?
✔✔M-mode - ✔✔What US modality would you us to prove fetal life on a frozen image?
✔✔Left Atrium - ✔✔The anatomic structure closest to the spine in a 4-chamber heart
view is?
✔✔Fetal Heart - ✔✔This occupies 1/3 of the chest cavity pointing toward the left side of
the fetus?
✔✔RVOT - Pulmonary Artery
LVOT - Ascending Aorta - ✔✔The great vessels of the heart consist of?
✔✔Foramen Ovale - ✔✔Communication between right and left Atria is termed?
✔✔45 degree angle to the left of midline - ✔✔In a normal fetus, the heart is positioned
at what angle?
✔✔Chordae Tendineae / papillary muscle - ✔✔A small rounded echoginic structure
withing the left ventrical of the heart is?
✔✔Coronal - ✔✔Which view best demonstrated the diaphram?
,Transverse @ the level of 4-chamber heart
✔✔Transverse view @ level of 4-chamber heart - ✔✔The thoracic circumference is
measured in the?
✔✔Aortic Arch - ✔✔The candy-cane pulsating vessel imaged somewhat to the left of
the spine in longitudinal is?
✔✔Esophageal Artesia - ✔✔The fluid filled stomach should always be seen in the upper
LT quadrant. If not seen, you should suspect?
✔✔Esophagel Atresia - ✔✔The esophagus does not properly develop or is missing?
✔✔12-13 weeks - ✔✔At what gestational age is the amniotic fluid volume and fluid in
the fetal bladder almost entirely due to functioning kidneys?
✔✔30-45 mins. - ✔✔The fetal bladder should fill and empty approximatly every?
✔✔Posterior Urethral Valves - ✔✔The bladder of the male fetus is sometimes enlarged
because of?
Most common cause of male fetus bladder obstruction outlet?
✔✔Clocal Malformation or Urethral Atresia - ✔✔Most common female bladder
obstruction outlet?
✔✔Iliac Bones - ✔✔What structures can be seen at the level of the bladder using a
coronal view of the fetal pelvis on an OB exam?
✔✔Abdomenal Circumference - ✔✔When you image the fetal stomach transverse at
the level of the portal vien, you are at the right level for what measurement?
✔✔MSAFP
Triple Screen
CVS
Amniocentesis - ✔✔What lab tests are performed to determine if a fetus has a neural
tube defect or Down's syndrome?
✔✔Amniocentesis - ✔✔This test can rule out Down's syndrome?
✔✔Fetal Anatomy - ✔✔2nd trimester OB US are better than 1st trimester in
determining?
✔✔Vertex - ✔✔Most favortable position of the baby for birth where the crown area of
the head presents first?
,✔✔Vasa Previa - ✔✔In sagittal midline view, if the cord is positioned near the cervical
os, this is called?
✔✔37 weeks - ✔✔Dr's usually don't consider a C-section due to previa until what
gestational week?
✔✔Chorion and Decidua - ✔✔Th placenta developes from the?
✔✔Excessive Wharton's jelly - ✔✔A thickened appearing cord is most likely from?
✔✔Functions of the placenta - ✔✔This produces alpha-fetoprotein, provides nurishment
for the fetus as well as protection?
✔✔Succenturiate Placenta - ✔✔An accessory placenta lobe is called?
✔✔2cm - ✔✔A placenta previa can be ruled out if the placental edge is at least how far
from the internal cervical os?
✔✔Placenta Accreta - ✔✔A severe OB complication involving an abnormally deep
attachment of the placenta through the endometrium and myometrium?
✔✔Hydrops
Infection
Triploidy-lethal chromosome abnormality (69 instead of 46)
Diabetes - ✔✔A placental measuring 7cm in the greatest AP dimension may be
associated with?
✔✔4cm - ✔✔The thickness of the full-term placental should not measure more than?
✔✔Chorioangioma - ✔✔Benign vascular tumors of the placenta, large ones can cause
IUGR, Hydrops and Abruption?
✔✔Superoir to fetal bladder - ✔✔To demonstrate umbilical cord insertion into the fetal
abdomen, you should look?
✔✔2 umbilical arteries - ✔✔Applying color Doppler to the transverse image through the
fetal bladder will help verify?
✔✔Placental Abruption - ✔✔The placental lining has separted from the uterus. Most
common pathological cause of late pregnancy bleeding?
✔✔BPD/OFD x 100 - ✔✔Cephalic Index formula?
, ✔✔Dolichocephaly - ✔✔Cephalic Index below 70%, head shape that is long and
narrow?
✔✔Brachycephaly - ✔✔Cephalic Index above 85%, head shape that is abnormally
short?
✔✔70 to 85% - ✔✔Normal Cephalic Index range?
✔✔CRL @ 10 weeks - ✔✔The best method and time for estimating gestational age
would be?
✔✔30 weeks - ✔✔Cerebellar measurements can be used to estimate gestational age
but loose accuracy after?
✔✔30 weeks - ✔✔Epiphyseal centers will not be identified sonographically until after?
✔✔Leading Edge - ✔✔BPD position calipers on outer edge of anterior skull and inner
edge of posterior skull is termed?
✔✔Amniocentesis - ✔✔Fetal lung maturity is best determined by?
✔✔Naegele's rule (approx. 280 days) - ✔✔One can caluclate a patient's due date by
adding 9 months + 7 days to the 1st day of last period. This is done according to?
✔✔Hegar's sign - ✔✔Present in 1st trimester, softening of utern consistancy and
possibility to palpate the connection between cervix and fundus?
✔✔Chadwick's sign - ✔✔Present in the 1st trimester, bluish discoloration of cervix,
vagina and labia caused by the hormone estrogen causing venous congestion?
✔✔Amenorrhea - ✔✔Absence of menstrual period?
✔✔Quickening - ✔✔When the mother start to feel movement between 16 and 20
weeks?
✔✔1mm (reliable up to 10 weeks) - ✔✔The size of the gestational sac should increase
daily by?
✔✔3 - ✔✔If no embryo is seen within a sac, one can roughly calculate the gestational
age in weeks by measuring the mean sac diameter and adding ___ to it?
✔✔2 weeks - ✔✔Gestational sac measurements are accurate in estimating gestational
age to within how many weeks?
AND ANSWERS SET A+
✔✔Lateral Ventricular Atria - ✔✔In ruling out hydrocephalus, where would one 1st
begin to see enlargement?
✔✔1cm in largest dimension transversely - ✔✔The normal measurements for the lateral
ventricla of the fetal brain are?
✔✔3 ossidication centers (2 posterior pointing toward each other, 1 anterior) - ✔✔When
the fetal spine is imaged transversly, the ultrasound demonstrates?
✔✔M-mode - ✔✔What US modality would you us to prove fetal life on a frozen image?
✔✔Left Atrium - ✔✔The anatomic structure closest to the spine in a 4-chamber heart
view is?
✔✔Fetal Heart - ✔✔This occupies 1/3 of the chest cavity pointing toward the left side of
the fetus?
✔✔RVOT - Pulmonary Artery
LVOT - Ascending Aorta - ✔✔The great vessels of the heart consist of?
✔✔Foramen Ovale - ✔✔Communication between right and left Atria is termed?
✔✔45 degree angle to the left of midline - ✔✔In a normal fetus, the heart is positioned
at what angle?
✔✔Chordae Tendineae / papillary muscle - ✔✔A small rounded echoginic structure
withing the left ventrical of the heart is?
✔✔Coronal - ✔✔Which view best demonstrated the diaphram?
,Transverse @ the level of 4-chamber heart
✔✔Transverse view @ level of 4-chamber heart - ✔✔The thoracic circumference is
measured in the?
✔✔Aortic Arch - ✔✔The candy-cane pulsating vessel imaged somewhat to the left of
the spine in longitudinal is?
✔✔Esophageal Artesia - ✔✔The fluid filled stomach should always be seen in the upper
LT quadrant. If not seen, you should suspect?
✔✔Esophagel Atresia - ✔✔The esophagus does not properly develop or is missing?
✔✔12-13 weeks - ✔✔At what gestational age is the amniotic fluid volume and fluid in
the fetal bladder almost entirely due to functioning kidneys?
✔✔30-45 mins. - ✔✔The fetal bladder should fill and empty approximatly every?
✔✔Posterior Urethral Valves - ✔✔The bladder of the male fetus is sometimes enlarged
because of?
Most common cause of male fetus bladder obstruction outlet?
✔✔Clocal Malformation or Urethral Atresia - ✔✔Most common female bladder
obstruction outlet?
✔✔Iliac Bones - ✔✔What structures can be seen at the level of the bladder using a
coronal view of the fetal pelvis on an OB exam?
✔✔Abdomenal Circumference - ✔✔When you image the fetal stomach transverse at
the level of the portal vien, you are at the right level for what measurement?
✔✔MSAFP
Triple Screen
CVS
Amniocentesis - ✔✔What lab tests are performed to determine if a fetus has a neural
tube defect or Down's syndrome?
✔✔Amniocentesis - ✔✔This test can rule out Down's syndrome?
✔✔Fetal Anatomy - ✔✔2nd trimester OB US are better than 1st trimester in
determining?
✔✔Vertex - ✔✔Most favortable position of the baby for birth where the crown area of
the head presents first?
,✔✔Vasa Previa - ✔✔In sagittal midline view, if the cord is positioned near the cervical
os, this is called?
✔✔37 weeks - ✔✔Dr's usually don't consider a C-section due to previa until what
gestational week?
✔✔Chorion and Decidua - ✔✔Th placenta developes from the?
✔✔Excessive Wharton's jelly - ✔✔A thickened appearing cord is most likely from?
✔✔Functions of the placenta - ✔✔This produces alpha-fetoprotein, provides nurishment
for the fetus as well as protection?
✔✔Succenturiate Placenta - ✔✔An accessory placenta lobe is called?
✔✔2cm - ✔✔A placenta previa can be ruled out if the placental edge is at least how far
from the internal cervical os?
✔✔Placenta Accreta - ✔✔A severe OB complication involving an abnormally deep
attachment of the placenta through the endometrium and myometrium?
✔✔Hydrops
Infection
Triploidy-lethal chromosome abnormality (69 instead of 46)
Diabetes - ✔✔A placental measuring 7cm in the greatest AP dimension may be
associated with?
✔✔4cm - ✔✔The thickness of the full-term placental should not measure more than?
✔✔Chorioangioma - ✔✔Benign vascular tumors of the placenta, large ones can cause
IUGR, Hydrops and Abruption?
✔✔Superoir to fetal bladder - ✔✔To demonstrate umbilical cord insertion into the fetal
abdomen, you should look?
✔✔2 umbilical arteries - ✔✔Applying color Doppler to the transverse image through the
fetal bladder will help verify?
✔✔Placental Abruption - ✔✔The placental lining has separted from the uterus. Most
common pathological cause of late pregnancy bleeding?
✔✔BPD/OFD x 100 - ✔✔Cephalic Index formula?
, ✔✔Dolichocephaly - ✔✔Cephalic Index below 70%, head shape that is long and
narrow?
✔✔Brachycephaly - ✔✔Cephalic Index above 85%, head shape that is abnormally
short?
✔✔70 to 85% - ✔✔Normal Cephalic Index range?
✔✔CRL @ 10 weeks - ✔✔The best method and time for estimating gestational age
would be?
✔✔30 weeks - ✔✔Cerebellar measurements can be used to estimate gestational age
but loose accuracy after?
✔✔30 weeks - ✔✔Epiphyseal centers will not be identified sonographically until after?
✔✔Leading Edge - ✔✔BPD position calipers on outer edge of anterior skull and inner
edge of posterior skull is termed?
✔✔Amniocentesis - ✔✔Fetal lung maturity is best determined by?
✔✔Naegele's rule (approx. 280 days) - ✔✔One can caluclate a patient's due date by
adding 9 months + 7 days to the 1st day of last period. This is done according to?
✔✔Hegar's sign - ✔✔Present in 1st trimester, softening of utern consistancy and
possibility to palpate the connection between cervix and fundus?
✔✔Chadwick's sign - ✔✔Present in the 1st trimester, bluish discoloration of cervix,
vagina and labia caused by the hormone estrogen causing venous congestion?
✔✔Amenorrhea - ✔✔Absence of menstrual period?
✔✔Quickening - ✔✔When the mother start to feel movement between 16 and 20
weeks?
✔✔1mm (reliable up to 10 weeks) - ✔✔The size of the gestational sac should increase
daily by?
✔✔3 - ✔✔If no embryo is seen within a sac, one can roughly calculate the gestational
age in weeks by measuring the mean sac diameter and adding ___ to it?
✔✔2 weeks - ✔✔Gestational sac measurements are accurate in estimating gestational
age to within how many weeks?
