Knowra Multiple pregnancy Multiple pregnancy Multiple pregnancy is a pregnancy involving two or more fetuses. It includes twin, triplet, and higher-order pregnancies, with risks shaped by placental arrangement and fetal development.
Zygosity : The genetic relationship between individuals, especially whether twins arose from one or multiple fertilized eggs. It distinguishes identical from fraternal twins, though it does not determine placental arrangement.
Twin-to-twin transfusion syndrome : A complication of monochorionic twins in which placental blood-vessel connections unbalance blood flow between them. It arises specifically when twins share a placenta with connecting vessels.
Ultrasound in pregnancy : The use of sound-wave imaging to assess fetal development, anatomy, and pregnancy structures. Early ultrasound establishes fetal number, chorionicity, and amnionicity.
Singleton pregnancy : A pregnancy involving one fetus. It provides the baseline for comparing maternal risks, fetal growth, and delivery timing.
Chorionicity : The number of chorions, or outer fetal membranes, in a multiple pregnancy. It is a major determinant of monitoring and complications in twin pregnancies.
Twin anemia–polycythemia sequence : A disorder in monochorionic twins in which slow blood transfer produces anemia in one twin and excess red cells in the other. It is another consequence of unequal blood exchange through a shared placenta.
Antenatal care : Health care provided during pregnancy to monitor maternal and fetal wellbeing. Multiple pregnancies require more frequent assessments than routine singleton care.
Twin pregnancy : A pregnancy involving two fetuses. Twins are the most common type of multiple pregnancy.
Amnionicity : The number of amniotic sacs surrounding fetuses in a multiple pregnancy. Shared or separate amniotic sacs change the risks associated with carrying multiples.
Selective fetal growth restriction : A condition in which one fetus in a multiple pregnancy grows substantially less than its co-fetus. Unequal placental supply can restrict growth in only one fetus.
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