2 - Chapter 50 - OB Measurements and Gestational Age Flashcards

1
Q

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

A

abdominal circumference (AC)

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2
Q

fetal parameters of size and proportionality expressed as age

A

age range analysis (ARA)

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3
Q

absence of one (cyclops) or both eyes

A

anophthalmos

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4
Q

average of multiple fetal parameters’ ages

A

average age (AA)

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5
Q

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

A

“banana” sign

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6
Q

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

A

binocular distance (BD)

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7
Q

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

A

biparietal diameter (BPD)

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8
Q

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

A

brachycephaly

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9
Q

see gestational sac

A

chorionic sac

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10
Q

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

A

crown-rump length (CRL)

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11
Q

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

A

embryonic heart rate (EHR)

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12
Q

measurement of the femoral diaphysis

A

femur length (FL)

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13
Q

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

A

gestational sac

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14
Q

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

A

gestational sac diameter

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15
Q

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

A

growth-adjusted sonar age (GASA)

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16
Q

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

A

humeral length

17
Q

condition in which the orbits are spaced far apart

A

hypertelorism

18
Q

condition in which the orbits are close together

A

hypotelorism

19
Q

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

A

intrauterine growth restriction (IUGR)

20
Q

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

A

last menstrual period (LMP)

21
Q

occurs with spina bifida; frontal bones collapse inward

A

“lemon” sign

22
Q

small eyes

A

microphthalmos

23
Q

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

A

oxycephaly

24
Q

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

A

platycephaly

25
Q

a normal fetus that measures smaller than dates

A

small for gestational age (SGA)

26
Q

failure of the vertebrae to close

A

spina bifida

27
Q

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

A

dolichocephaly