DMS 212: Ch 52 OB Measurements & Gestational Age
(A+ Guaranteed Answers)
abdominal circumference (AC) correct answers measurement at the level of the stomach, left
portal vein, and left umbilical vein
age range analysis (ARA) correct answers fetal parameters of size and proportionality expressed
as age
average age (AA) correct answers average of multiple fetal parameters' ages
biparietal diameter (BPD) correct answers fetal transverse cranial diameter at the level of the
thalamus and cavum septum pellucidum
brachycephaly correct answers fetal head is relatively wide in the transverse diameter and
shortened in the AP diameter
crown-rump length (CRL) correct answers most accurate measurement for determining
gestational age; made in the first trimester
dolichocephaly correct answers fetal head is relatively narrow in the transverse plane and
elongated in the AP plane
embryonic heart rate (EHR) correct answers the heart rate before the early 9th week of gestation
femur length (FL) correct answers measurement of the femoral diaphysis
fetal age correct answers begins at the time of conception and is also known as conceptional age
gestational (chorionic) sac correct answers structure that is normally found within the uterus and
contains the developing embryo
gestational sac diameter correct answers used in the first trimester to estimate appropriate
gestational age with menstrual dates
growth-adjusted sonar age (GASA) correct answers the method whereby the fetus is categorized
into small, average, or large growth percentile
humeral length correct answers measurement from the humeral head to the distal end of the
humerus
intrauterine growth restriction (IUGR) correct answers decreased rate of fetal growth; may be
symmetric (all growth parameters are small) or asymmetric (may be caused by placental
problem; head measurements correlate with dates; body disproportionately smaller); usually a
(A+ Guaranteed Answers)
abdominal circumference (AC) correct answers measurement at the level of the stomach, left
portal vein, and left umbilical vein
age range analysis (ARA) correct answers fetal parameters of size and proportionality expressed
as age
average age (AA) correct answers average of multiple fetal parameters' ages
biparietal diameter (BPD) correct answers fetal transverse cranial diameter at the level of the
thalamus and cavum septum pellucidum
brachycephaly correct answers fetal head is relatively wide in the transverse diameter and
shortened in the AP diameter
crown-rump length (CRL) correct answers most accurate measurement for determining
gestational age; made in the first trimester
dolichocephaly correct answers fetal head is relatively narrow in the transverse plane and
elongated in the AP plane
embryonic heart rate (EHR) correct answers the heart rate before the early 9th week of gestation
femur length (FL) correct answers measurement of the femoral diaphysis
fetal age correct answers begins at the time of conception and is also known as conceptional age
gestational (chorionic) sac correct answers structure that is normally found within the uterus and
contains the developing embryo
gestational sac diameter correct answers used in the first trimester to estimate appropriate
gestational age with menstrual dates
growth-adjusted sonar age (GASA) correct answers the method whereby the fetus is categorized
into small, average, or large growth percentile
humeral length correct answers measurement from the humeral head to the distal end of the
humerus
intrauterine growth restriction (IUGR) correct answers decreased rate of fetal growth; may be
symmetric (all growth parameters are small) or asymmetric (may be caused by placental
problem; head measurements correlate with dates; body disproportionately smaller); usually a
