Multiple Pregnancy

Multiple Pregnancy

Multiple Pregnancy
Incidence of multiple pregnancy

  • Multiple gestation is increasingly common
  • Over 3% of births in UHG are twins (Smith, K et al., 2010)
  • Mainly due to assisted reproduction techniques & increased maternal age
  • DZ more common in multiparous, family history & good nutritional status
  • Increased risk of complications with twins


  • Reflects the type of conception, one or two fertilized eggs
  • 2/3 of twins dizygotic
  • Fertilization of more than one egg
  • Non identical or fraternal twins
  • Genetically no more alike than siblings
  • DCDA

Monozygotic Twins

  • 1/3 of all twin pregnancies
  • Splitting of one embryo after fertilization
  • Chorionicity depends on when splitting occurs
  • Identical and share similar genetic material

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