Chapter 52 - Obstetric Measurements and Gestational Age

C

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

a. CSP and fall cerebri

b. third ventricle and brainstem

c. thalamus and brainstem

d. atrium and lateral ventricle and thalamus

D

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

a. BPD

b. head circumference

c. CRL

d. AC

C

With normal transvaginal sonography, cardiac activity should demonstrate when CRL exceeds ___ mm.

a. 5

b. 6

c. 7

d. 8

C

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

C

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

a. is taken from the pointed end to the pointed end

b. should include the distal femoral epiphysis

c. includes only the femoral diaphysis

d. should include the femoral head

C

Measurements of the BD 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

C

The widest transverse diameter of the skull and the proper level to measure the biparietal diameter (BPD) includes which one of the following structures?

a. Peduncles

b. Fourth ventricle

c. Thalamus

d. Corpus callosum

B

The abdominal circumference (AC) is the:

A. Diameter of the fetal abdomen

B. Measurement at the 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. Measurement at the level of the kidneys and bladder

C

This is a sonographic sign that refers to the shape of the cerebellum when a spinal defect is present:

A. Sandwich sign

B. Strawberry sign

C. Banana sign

D. Lemon sign

A

The biparietal diameter is the measurement of the fetal head at the level of the:

A. Thalamus and cavum septum pellucidum

B. Frontal horns and third ventricle

C. Peduncles and septum pellucidum

D. Thalamus and fourth ventricle

C

The condition that shows the fetal head elongated in the transverse diameter and shortened in the Anteroposterior diameter is known as:

A. Dolichocephaly

B. Elongichocephaly

C. Brachycephaly

D. Minicephaly

A

The most accurate measurement for determining gestational age is the:

A. Crown rump length

B. Biparietal diameter

C. Abdominal circumference

D. Femur length

D

The condition in which the orbits are spaced far apart is known as:

A. Hypotelorism

B. Cyclops

C. Anophthia

D. Hypertelorism

C

When measuring the gestational sac, all except which of the following are true?

A. A distended urinary bladder can compress the sac from round to ovoid

B. If the sac is round, measure one diameter

C. If the sac is ovoid, measurements cannot be obtained

D. If the sac is ovoid, measure A-P width to obtain mean diameter

D

When the mean gestational sac diameter (MSD) exceeds ____ mm, an embryo with definite cardiac activity should be well visualized with transvaginal scanning.

A. 7

B. 10

C. 13

D. 16

C

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

B

Frontal bones of the cranium that collapse forward describe which one of the following abnormalities?

A. Banana sign

B. Lemon sign

C. Mickey Mouse sign

D. Acrocephaly

C

Absence of one or both eyes is called:

A. Hypotelorism

B. Microphthalmos

C. Anophthalmos

D. Cyclops

C

With endovaginal sonography normal, cardiac activity should be demonstrated when the crown-rump length exceeds:

A. 5 mm

B. 6 mm

C. 7 mm

D. 8 mm

D

Which measurement is devised to determine the normality of the fetal head shape?

A. Head circumference

B. Biparietal diameter

C. Head circumference: abdominal circumference ratio

D. Cephalic index

C

Which fetal measurement is about as accurate as the biparietal diameter in determining gestational age?

A. abdominal circumference

B. head circumference

C. femur length

D. cephalic index

B

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

C

The method whereby the fetus is categorized into the small, average, or large growth percentiles is called:

A. Intrauterine growth restriction

B. Biophysical profile

C. Growth-adjusted sonar age

D. Age range analysis

C

The femur length measurement:

A. is taken from the pointed end to pointed end

B. should include the distal femoral epiphysis

C. includes only the femoral diaphysis

D. should include the femoral head

D

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

A

The binocular distance (BD):

A. Includes both orbits at the same time

B. Is the length between the two orbits

C. Is the distance of an orbit

D. Is the depth of both orbits

D

Gestational age can best be predicted from the:

A. Interocular distance

B. Orbital diameter

C. Intraocular distance

D. Binocular distance

A

With endovaginal sonography, the earliest appearance of a normal intrauterine gestational sac should be seen with a serum beta hCG above:

A. 500 mIU/ml

B. 1000 mIU/ml

C. 1500 mIU/ml

D. 2000 mIU/ml

C

Flattening of the fetal skull is called:

A. Oxycephaly

B. Dolichocephaly

C. Platycephaly

D. Acrocephaly

B

Linear appearance of the embryonic heart rate correlates well with gestational age up to:

A. 8 menstrual weeks

B. 9 gestational weeks

C. 10 menstrual weeks

D. 12 conceptional weeks

C

A condition in which the fetus is not growing as fast as normal is termed:

A. Growth-adjusted sonar age

B. Age range analysis

C. Intrauterine growth restriction

D. Microcephaly

A

Measurement of the biparietal diameter is taken from the:

A) outer edge to inner edge

B) outer edge to outer edge

C) inner edge to inner edge

D) outer edge to falx multiplied by two