You are about to take the CME Quiz for Twin Growth .

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Twin Growth


1. Twin gestations normally occur once in every __________ live births:

a. 60

b. 80

c. 100

d. 120

e. 140

2. _______% of monozygotic twins are dichorionic/diamniotic:

a. 10

b. 20

c. 30

d. 40

e. 50

3. Over _______% of twins are currently the result of infertility treatment:

a. 10

b. 20

c. 30

d. 40

e. 50

 

4. Chorionicity can be predicted by determining the number of gestational sacs on a 5 to 6 weeks ultrasound examination:

a. True

b. False


5. A "twin peak sign" indicates a monochorionic twin pregnancy.

a. True

b. False

6. The following statements about twin pregnancies are true, except:

a. The zygosity of twins, rather than chorionicity determines outcome

b. When twins are detected prior to 7 weeks' gestation, only approximately 70% end in live twin neonates

c. 60% of women carrying twins deliver by 38 weeks' gestation

d. When 2 distinct placentas are visualized, the twins are usually dichorionic

7.  The following statements about twin pregnancies are true, except:

a. After 37 weeks' gestation, twins have a higher stillbirth rate than singletons

b. Perinatal mortality increases several fold in twins after 39 weeks' gestation

c. In dichorionic twins, 1st trimester growth discordance is associated with aneuploidy and miscarriage

d. When there is a discrepancy in crown-rump lengths, the smaller should be used for gestational age assessment

 

8. The following statements about twin gestations are true, except:s

a. Growth of the head circumference in twins is significantly slower than singletons

b. The difference in the growth rate of the long bones for twins and singletons is not clinically relevant

c. The growth rate of the abdominal circumference in twins decreases significantly after 32 to 34 weeks' gestation

9. The following statements about twins are true, except:

a. Fetal weight discordance increases the incidence of adverse perinatal outcome among both appropriately grown and small-for-gestational age twins

b. 15% of twins have a discordant weight of > 30%

c. Growth discordancy is potentially more serious in monochorionic twins

10. The following statements about twins are true, except:

a. Growth discordancy of 30% is the best threshold to predict adverse neonatal outcome

b. Discordant growth in monochorionic twins is associated with a velamentous cord insertion

c. If an ultrasound at 20-24 weeks has normal twin growth, the likelihood of abnormal growth later in gestation is significantly reduced

d. The incidence of growth restriction in twins has been reported to be between 5% and 10%

 


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