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Journal of Perinatal Medicine

Official Journal of the World Association of Perinatal Medicine

Editor-in-Chief: Dudenhausen, MD, FRCOG, Joachim W.

Ed. by Bancalari, Eduardo / Chappelle, Joseph / Chervenak, Frank A. / D'Addario , Vincenzo / Genc, Mehmet R. / Greenough, Anne / Grunebaum, Amos / Konje, Justin C. / Kurjak M.D., Asim / Romero, Roberto / Zalud, MD PhD, Ivica

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Volume 42, Issue 2


Survival and neonatal morbidity among extremely preterm born infants in relation to gestational age based on the last menstrual period or ultrasonographic examination

Marija Simic
  • Corresponding author
  • Karolinska Institute, Department of Women’s and Children’s Health, Stockholm, Sweden
  • Department of Obstetrics and Gynecology, Karolinska University Hospital, Solna 171 76 Stockholm, Sweden
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Isis Amer-Wåhlin / Hugo Lagercrantz / Karel Maršál
  • Department of Obstetrics and Gynecology, Clinical Sciences Lund, Lund University, Lund, Sweden
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Karin Källén
  • Department of Obstetrics and Gynecology, Clinical Sciences Lund, Lund University, Lund, Sweden
  • Center of Reproductive Epidemiology, Lund University, Lund, Sweden
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2013-11-21 | DOI: https://doi.org/10.1515/jpm-2013-0061


Objectives: The aim of this study was to investigate the potential impact of gestational age (GA) estimation on the basis of the last menstrual period (LMP) in comparison with GA based on ultrasound examination on rates of survival and neonatal morbidity among extremely preterm infants.

Methods: The Swedish national registry of infants born extremely preterm (Extremely Preterm Infants in Sweden Study), including infants born before 27 weeks of gestation, was used to identify 645 infants with available information. Incidences of stillbirth, survival, small for GA (SGA), and major neonatal morbidity were calculated in relationship to the GA estimated by each of the approaches.

Results: Pregnancies, in general, appeared to be longer when GA was estimated by LMP than by ultrasound (17.2% of the pregnancies were longer than 27 weeks). The incidences of stillbirth, neonatal death, and major neonatal morbidity in relationship to GA were similar for both groups. The risks for SGA were elevated when GA according to ultrasound examination was at least 7 days shorter than GA based on the LMP.

Conclusions: In our cohort of infants born extremely preterm, estimation of GA on the basis of LMP indicated a longer pregnancy than estimated by ultrasound but did not influence the incidences of neonatal survival and morbidity.

Keywords: Extremely preterm infants; gestational age estimation; pregnancy; pregnancy dating; ultrasound


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About the article

Corresponding author: Marija Simic, Department of Obstetrics and Gynecology, Karolinska University Hospital, Solna 171 76 Stockholm, Sweden; and Karolinska Institute, Department of Women’s and Children’s Health, Stockholm, Sweden, Tel.: +46 707530508, E-mail:

Received: 2013-03-17

Accepted: 2013-10-14

Published Online: 2013-11-21

Published in Print: 2014-03-01

Citation Information: Journal of Perinatal Medicine, Volume 42, Issue 2, Pages 247–253, ISSN (Online) 1619-3997, ISSN (Print) 0300-5577, DOI: https://doi.org/10.1515/jpm-2013-0061.

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