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