Lecture 5B - Fetal Age + Growth

Question 1

2 clinical ways of measuring GA

Answer 1

uterine size/growth

LMP

Question 2

Exception in which LMP IS accurate (normally is not)

Answer 2

IVF

Question 3

cons/inaccuracy to measuring GA with uterine size (3)

Answer 3

fibroids
multiple pregnancy
body habitus

Question 4

small for dates (SFD) (4)

Answer 4

wrong dates
miscarriage
oligohydramnios
inadequate fetal growth (IUFG)

Question 5

large for dates (LFD) (5)

Answer 5

wrong dates
multifetal gestation
polyhydraminos
fetal macrosomia
fibroids

Question 6

sono measures can be used to determine (3)

Answer 6

fetal age
growth
Estimated fetal weight (EFW)

Question 7

early sono findings to determine GA (pre 6 weeks)

Answer 7

gest sac = 5 wk
gest sac + YS = 5.5 wk
gest sac + embryo = 6 wk

Question 8

when is CRL used to determine GA? when is it unreliable

Answer 8

6 weeks

12 weeks

Question 9

t/f with increasing GA, accuracy of measures decrease

Answer 9

true

Question 10

4 min measurements for 2nd/3rd trimester

Answer 10

BPD
HC
AC
Femur length

Question 11

what plane do you measure BPD, HC, OFD?

Answer 11

transverse

Question 12

what are landmarks for head measurements? (3)

Answer 12

falx cerebri
cavum septum pellucidum (CSP)
thalami

Question 13

HC formuma

Answer 13

HC = (BPD + OFD) x 1.57

Question 14

t/f HC is a better predictor than BPD for GA

Answer 14

true

Question 15

anechoic “box” anterior to thalamus

Answer 15

CSP

Question 16

in what plane do you measure abdo circumference

Answer 16

transverse

Question 17

landmarks for AC

Answer 17

liver
umbilical vein
stomach

Question 18

AC formuma

Answer 18

AC = (AD1 + AD2) x 1.57

Question 19

what are you measuring with femur length? in which field?

Answer 19

long axis of femoral diaphysis - NOT INCLUDING distal hypo epiphysis
- the nearfield

Question 20

what is composite dating

Answer 20

using a combination of 2 or more parameters to calc mean GA (if 2 standard deviations, omit from average)

Question 21

SGA

Answer 21

small gestational age

Question 22

LGA

Answer 22

large gestational age

Question 23

what is considered SGA

Answer 23

below 10th percentile

Question 24

what is considered LGA

Answer 24

above 90th percentile

Question 25

weight gain reaches a max rate of ______ per week

Answer 25

220 g (1/2 lb)