Twins, chorionicity and zygosity

Twin Res. 2001 Jun;4(3):134-6. doi: 10.1375/1369052012344.


Accurate determination of zygosity and chorionicity is essential in all multiple maternities. The parents and the multiples themselves ask it. It is of medical importance and now considered as a prerequisite in several domains of twin research, especially when perinatal data are analysed. It helps the multiples and their parents and teachers to ascertain identity. The methods are briefly described and a plea is made to obstetricians and paediatricians to use them systematically at the time of birth.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Amnion / cytology*
  • Chorion* / diagnostic imaging
  • Congenital Abnormalities / diagnosis*
  • DNA / analysis*
  • Diseases in Twins*
  • Female
  • Fetal Death / genetics
  • Fetal Diseases / diagnosis
  • Humans
  • Infant, Newborn
  • Male
  • Polymerase Chain Reaction
  • Pregnancy
  • Pregnancy, Multiple*
  • Prenatal Diagnosis
  • Twins, Dizygotic* / genetics
  • Twins, Monozygotic* / genetics
  • Ultrasonography


  • DNA