Deck 52: Obstetric Measurements and Gestational Age

Question 1

Which one of the following biometric measurements is more useful as a growth parameter?

A) BPD
B) Head circumference
C) CRL
D) Abdominal circumference

Answer 1

D

Question 2

With transvaginal sonography, the earliest appearance of a normal intrauterine gestational sac should be seen with a serum beta human chorionic gonadotropin (hCG) greater than _____ mega international units per milliliter (mIU/ml).

A) 500
B) 1000
C) 1500
D) 2000

Answer 2

A

Question 3

When measuring the gestational sac, all of the following statements are true except:

A) a distended urinary bladder can compress the sac from round to ovoid.
B) if the sac is round, one diameter should be measured.
C) if the sac is ovoid, measurements cannot be obtained.
D) if the sac is ovoid, the anteroposterior and width are measured to obtain mean diameter.

Answer 3

C

Question 4

The plane used for a coronal head circumference (CHC) should include which of the following structures?

A) CSP and falx cerebri
B) Third ventricle and brainstem
C) Thalamus and brainstem
D) Atrium of the lateral ventricle and thalamus

Question 5

The condition that shows the fetal head elongated in the transverse diameter and shortened in the anteroposterior diameter is known as which one of the following?

A) Dolichocephaly
B) Elongichocephaly
C) Brachycephaly
D) Minicephaly

Question 6

Which one of the following sonographic signs refers to the shape of the cerebellum when a spinal defect is present?

A) Sandwich
B) Strawberry
C) Banana
D) Lemon

Question 7

Which one of the following measurements is devised to determine the normality of the fetal head shape?

A) Abdominal circumference
B) BPD
C) Head circumference:abdominal circumference ratio
D) Cephalic index

Question 8

Which one of the following fetal measurements is about as accurate as the BPD in determining gestational age?

A) AC
B) Head circumference
C) Femur length
D) Cephalic index

Question 9

Gestational age can best be predicted from which one of the following?

A) Interocular distance
B) Orbital diameter
C) Intraocular distance
D) Binocular distance

Question 10

All long bones should be measured if the difference between the femur length and all other biometric parameters is which one of the following?

A) Greater than 3 weeks
B) Greater than 4 weeks
C) Greater than 1 week
D) 2 weeks or greater

Question 11

With normal transvaginal sonography, cardiac activity should be demonstrated when the CRL exceeds ______ mm.

A) 5
B) 6
C) 7
D) 8

Question 12

Which one of the following statements about the femur length measurement is true?

A) It is taken from the pointed end to the pointed end.
B) It should include the distal femoral epiphysis.
C) It includes only the femoral diaphysis.
D) It should include the femoral head.

Question 13

Which one of the following statements describes the binocular distance (BD)?

A) It includes both orbits at the same time.
B) It is the length between the two orbits.
C) It is the distance of an orbit.
D) It is the depth of both orbits.

Question 14

The biparietal diameter (BPD) is the measurement of the fetal head at the level of which of the following structures?

A) Thalamus and cavum septum pellucidum (CSP)
B) Frontal horns and third ventricle
C) Peduncles and septum pellucidum
D) Thalamus and fourth ventricle

Question 15

The fetal orbits should be measured:

A) at the same level as the BPD.
B) in a plane slightly caudal to the BPD.
C) in a plane slightly cephalic to the BPD.
D) in the occipitoanterior position.

Question 16

The absence of an embryo in an intrauterine pregnancy of 7 to 8 weeks is consistent with which one of the following?

A) Placenta previa
B) Ectopic pregnancy
C) Anembryonic pregnancy
D) Multiple gestation

Question 17

Which one of the following measurements is the most accurate for determining gestational age in the first trimester?

A) Crown-rump length (CRL)
B) BPD
C) MSD
D) Yolk sac diameter

Question 18

Frontal bones of the cranium that collapse inward describes which one of the following abnormalities?

A) Banana sign
B) Lemon sign
C) Mickey Mouse sign
D) Acrocephaly

Question 19

The fetus is categorized into the small, average, or large growth percentiles in which one of the following methods?

A) Intrauterine growth restriction (IUGR)
B) Biophysical profile
C) Growth-adjusted sonar age
D) Age-range analysis

Question 20

The abdominal circumference (AC) is taken at the ________________________.

A) diameter of the fetal abdomen
B) level of the stomach, left portal vein, and left umbilical vein
C) diameter of the fetal abdomen at the level of the kidneys and diaphragm
D) level of the kidneys and bladder

Question 21

Measurement of the binocular distance is taken from the ___________ edge of one orbit to the ___________ edge of the contralateral orbit.

A) outer; inner
B) inner; inner
C) outer; outer
D) inner; outer

Question 22

A condition in which the fetus is not growing at a normal rate is which one of the following?

A) Growth-adjusted sonar age
B) Age-range analysis
C) IUGR
D) Microcephaly

Question 23

Measurement of the BPD is taken from the __________ edge to the ___________.

A) outer; inner edge
B) outer; outer edge
C) inner; inner edge
D) outer; falx multiplied by two

Question 24

Linear acceleration of the embryonic heart rate correlates well with gestational age up to _________________ weeks.

A) 8 menstrual
B) 9 gestational
C) 10 menstrual
D) 12 conception