Society for Maternal-Fetal Medicine Special Statement: Updated checklists for management of monochorionic twin pregnancy

Am J Obstet Gynecol. 2020 Nov;223(5):B16-B20. doi: 10.1016/j.ajog.2020.08.066. Epub 2020 Aug 27.


Approximately 20% of twin pregnancies are monochorionic. The management of monochorionic twin pregnancy involves several additional interventions beyond the routine management of singletons or dichorionic twins. In 2015, the Society for Maternal-Fetal Medicine posted checklists for monochorionic/diamniotic twins and monochorionic/monoamniotic twins. The Society presents updated versions of these 2 checklists reflecting recent changes in practice recommendations. Suggestions for implementing the use of the checklists into antenatal care practices are also included.

Keywords: checklist; chorionicity; monoamniotic twin pregnancy; monochorionic twin pregnancy; patient counseling.

MeSH terms

  • Adrenal Cortex Hormones / therapeutic use
  • Amnion
  • Cardiotocography / methods
  • Checklist*
  • Chorion
  • Delivery, Obstetric / methods*
  • Female
  • Fetal Growth Retardation / diagnostic imaging
  • Fetofetal Transfusion / diagnostic imaging
  • Fetofetal Transfusion / therapy
  • Humans
  • Patient Education as Topic
  • Pregnancy
  • Pregnancy, Twin*
  • Prenatal Care / methods*
  • Ultrasonography, Prenatal


  • Adrenal Cortex Hormones