Fetal Measurements And Growth

Question 1

Used in first trimester to estimate GA when no embryo is visualized

Answer 1

Gestational sac size

Question 2

Crown-rump length is taken from top of head to

Answer 2

Bottom of torso

Question 3

CRL is useful until what GA

Answer 3

12 weeks

Question 4

Biparietal diameter is measured on an axial image of the fetal head at the level of _____ to ______

Answer 4

3rd ventricle and thalamus

Outer table of near cranium to inner table of far cranium

Question 5

Elongated skill

Answer 5

Dolicocephaly

Question 6

Round skull

Answer 6

Brachycephaly

Question 7

Outer perimeter of fetal cranium measured in the same plane as the BPD

Answer 7

Head circumference

Question 8

Independent of head shape

Answer 8

Head circumference

Question 9

Abdominal circumference is measured on an axial plane image at the level of

Answer 9

Intrahepatic portion of umbilical vein

Question 10

Measurement of the ossified portion of femoral diaphysis

Answer 10

Femur length

Question 11

Composite of BPD, HC, AC and FL measurements predicrs GA accurate to about 1.1 weeks at

Answer 11

12-18 weeks

Question 12

Composite of BPD, HC, AC and FL measurements predicrs GA accurate to about 1.8 weeks at

Answer 12

24-30 weeks

Question 13

Composite of BPD, HC, AC and FL measurements predicrs GA accurate to about 3.1 weeks at

Answer 13

36-42 weeks

Question 14

Used to measure BPD and HC

Answer 14

Transthalamic plane

Question 15

Axial plane at the level of the ventricular atria. Dominant landmark is the echogenic choroid plexus

Answer 15

Transventricular plane

Question 16

Axial scan approximately 10-15 degrees of inclination from the canthomeatal line. Anatomic landmarks include the inferior portion of the third ventricle and cerebellar hemispheres outlined by fluid in cisterna magna

Answer 16

Transcerebellar plane

Question 17

Normal cisterna magna is ____ in width

Answer 17

2-11 mm

Question 18

Ventricle atria width

Answer 18

Less than 10mm

Question 19

What part of liver is larger in the fetus, right or left?

Answer 19

Left lobe

Question 20

Half the blood it carries goes directly to IVC through the ductus venosus and the other half perfuses the liver thru the left portal vein

Answer 20

Umbilical vein

Question 21

20 times larger in relative size because of presence of “fetal zone”

Answer 21

Adrenal glands

Question 22

Fetal stomach should be filled with swallowed fluid by what weeks

Answer 22

18 weeks

Question 23

Small bowl peristalsis may be seen by

Answer 23

3rd trimester

Question 24

Small bowel loop normal diameter and length in fetus

Answer 24

6 mm diameter, 15 mm length

Question 25

Colon is visualized after ____ weeks as a tubular structure around the periphery of abdomen

Answer 25

20 weeks

Question 26

Normal colon diameter of fetus

Answer 26

23 mm

Question 27

Length of normal fetal kidneys in mm is approximately equal to

Answer 27

GA in weeks