Chapter 50 - OB Measurements and Gestational Age Flashcards Preview

Diagnostic Sonography - Hagen > Chapter 50 - OB Measurements and Gestational Age > Flashcards

Flashcards in Chapter 50 - OB Measurements and Gestational Age Deck (27)
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1

measurement at the level of the stomach, left portal vein, and left umbilical vein

abdominal circumference (AC)

2

fetal parameters of size and proportionality expressed as age

age range analysis (ARA)

3

absence of one (cyclops) or both eyes

anophthalmos

4

average of multiple fetal parameters’ ages

average age (AA)

5

refers to the shape of the cerebellum when a spinal defect is present (cerebellum is pulled downward into the foramen magnum)

“banana” sign

6

measurement that includes both fetal orbits at the same time to predict gestational age

binocular distance (BD)

7

fetal transverse cranial diameter at the level of the thalamus and cavum septum pellucidum

biparietal diameter (BPD)

8

fetal head is relatively wide in the transverse diameter and shortened in the anteroposterior diameter

brachycephaly

9

see gestational sac

chorionic sac

10

most accurate measurement for determining gestational age; made in the first trimester

crown-rump length (CRL)

11

the heart rate before the early 9th week of gestation (after the LMP)

embryonic heart rate (EHR)

12

measurement of the femoral diaphysis

femur length (FL)

13

structure that is normally found within the uterus and contains the developing embryo

gestational sac

14

used in the first trimester to estimate appropriate gestational age with menstrual dates

gestational sac diameter

15

the method whereby the fetus is categorized into small, average, or large growth percentile

growth-adjusted sonar age (GASA)

16

measurement from the humeral head to the distal end of the humerus

humeral length

17

condition in which the orbits are spaced far apart

hypertelorism

18

condition in which the orbits are close together

hypotelorism

19

condition in which the fetus is not growing as fast as normal; usually considered as being malnourished or abnormal

intrauterine growth restriction (IUGR)

20

the first day of the LMP is used as the start date for human pregnancies

last menstrual period (LMP)

21

occurs with spina bifida; frontal bones collapse inward

“lemon” sign

22

small eyes

microphthalmos

23

the condition of having a relatively high cranial vault with a high or peaked appearance; it is caused by molding of the cranium, exaggerating the vertical axis, or in more severe cases by premature closure of the coronal, sagittal, and lambdoidal sutures and with a vertical index above 77

oxycephaly

24

flattening of the vertex of the skull; it is often associated with cranial molding, flattening the top of the skull, and compensatory exaggeration of the biparietal diameter

platycephaly

25

a normal fetus that measures smaller than dates

small for gestational age (SGA)

26

failure of the vertebrae to close

spina bifida

27

fetal head is relatively narrow in the transverse plane and elongated in the anteroposterior plane

dolichocephaly