Chapter 52- Fetal Measurments

Question 1

First trimester measurements

Answer 1

CRL, MSD

Question 2

2nd/3rd trimester measurements

Answer 2

• Head circumference(HC)
• Bi Parietal Diameter(BPD)
• Femur Length (FL)
• Abdominal Circumference (AC)

Question 3

The first and most widely accepted means of measuring the fetal head and estimating fetal age in the 2nd trimester

Answer 3

BPD

Question 4

BPD should be measure in _____ plane

Answer 4

Transverse

Question 5

BPD is measured at what level

Answer 5

Midline— thalamus, CSP, midline falx

Question 6

For BPD: calipers should be placed…

Answer 6

Outer edge to inner edge

Question 7

HC is imaged/measure in ____ plane

Answer 7

Transverse, same level as BPD

Question 8

Measurement from occipital bone to frontal bone

Answer 8

OFD

Question 9

Head is SHORTENED in the transverse diameter(BPD) and ELONGATED in the AP diameter(OFD)

Answer 9

Dolichocephaly

Question 10

Can cause underestimation of fetal age

Answer 10

Dolichocephaly

Question 11

Head is ELONGATED in the transverse diameter(BPD) and SHORTENED in the AP diameter (OFD)

Answer 11

Brachycephaly

Question 12

Can cause over estimation of fetal age

Answer 12

Brachycephaly

Question 13

Cephalic index formula:

Answer 13

CI= (BPD/OFD) x 100

Question 14

Normal cephalic index

Answer 14

80% + or - 1%

Question 15

Range of normal cephalic index

Answer 15

75-85 %

Question 16

CI of _____ suggests brachycephaly

Answer 16

Greater than 85%

Question 17

CI of _____ suggests dolichocephaly

Answer 17

Less than 75%

Question 18

Abdominal circumference should be measured _____

Answer 18

Transverse

Question 19

Abdominal circumference should be measured at the level of

Answer 19

The liver where the umbilical vein branches into the left portal sinus

Question 20

The umbilical vein and portal vein form a ____

Answer 20

J-shape

Question 21

Kidneys should NOT be seen on the plane for abdominal circumference

Answer 21

True

Question 22

Has the largest reported variability & is more affected by growth disturbances

Answer 22

Abdominal circumference

Question 23

Most widely measured and easiest to obtain

Answer 23

Femur length

Question 24

If two week or greater difference between FL and all other measurements, what should be done?

Answer 24

Measure all long bones

Question 25

Short long bones are associated with

Answer 25

Trisomy and dwarfism

Question 26

Out of the tibia and fibula which is larger

Answer 26

Tibia

Question 27

Tibia is ____ to the fibula

Answer 27

Medial

Question 28

Humerus is usually found closest to the

Answer 28

Fetal trunk

Question 29

Out of the ulna and the radius which is larger

Answer 29

Ulna

Question 30

Ulna is _____

Answer 30

Medial

Question 31

Radius is ____ side

Answer 31

Thumb side

Question 32

Measuring what structure is more accurate than the BPD for measuring fetal age

Answer 32

Measuring the cerebellum

Question 33

Why is the cerebellum more accurate than the BPD for measuring fetal age?

Answer 33

Posterior fossa is not affected by some conditions that affect fetal growth

Question 34

A ____ shaped cerebellum is associated with spina bifida

Answer 34

Banana

Question 35

Cerebellum should have a _____ shape

Answer 35

Peanut or dumbbell

Question 36

Cerebellum Widest _____ diameter should be measured

Answer 36

Trans