multiple gestations
What percentage of twins is monozygotic?
30
Fraternal twins result from:
Dizygotic twinning
Which of the following can occur as a result of monozygotic twinning?
all the above
Which term relates the number of amniotic sacs?
amnionicity
Advanced maternal age is considered:
>35
Acardiac twinning results from:
Abnormal links among the placental vessels
In a twin gestation with a placenta on the anterior wall and a second on the posterior wall, what would be the membrane configuration?
Dichorionic/diamniotic
Twins having one placenta and one amniotic sac are referred to as:
Monochorionic monoamniotic
Twins that have the threat of being conjoined are:
Monochorionic monoamniotic
Which form of monozygotic twinning is least common?
Monochorionic monoamniotic
Identical twins result from:
Monozygotic twinning
Which of the following types of conjoined twins occur most often?
Thoracopagus
Which term relates the number of placentas?
both a and b
The outer membrane surrounding the fetus is referred to as the:
chorion
Twins whose bodies are connected at some point are said to be:
conjoined
Choose the primary factor for increased multiple births?
delayed childbearing
Which of the following can occur as a result of dizygotic twinning?
dichorionic diamniotic twins
Typically, the first sonographic manifestation of twin-twin transfusion syndrome is:
discordant fetal growth
Identify the term describing a twin found within the abdomen of its sibling.
fetus in fetu
All of the following complications are associated with multiple gestations except:
high birth weight
Select the clinical finding that raises suspicion for a multiple pregnancy.
large for gestational age
Conjoined twins that are attached at the abdomen are referred to as:
omphalopagus
Factors that increase the likelihood of having multiple gestations include all of the following except:
poor nutritional state
The twin that will appear larger in twin-twin transfusion syndrome is the:
recipient