Some perinatal characteristics of monozygotic twins who are dichorionic

Authors

  • Geoffrey Machin M.D.,

    Corresponding author
    1. Department of Laboratory Medicine and Pathology, University of Alberta Hospitals, Edmonton, Alberta, Canada
    • Department of Laboratory Medicine and Pathology, 5B4.08 Mackenzie Health Sciences Centre, University of Alberta Hospitals, Edmonton, Alberta, Canada, T6G 2R7
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  • Fiona Bamforth,

    1. Department of Laboratory Medicine and Pathology, University of Alberta Hospitals, Edmonton, Alberta, Canada
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  • Micheil Innes,

    1. Department of Laboratory Medicine and Pathology, University of Alberta Hospitals, Edmonton, Alberta, Canada
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  • Kim McNichol

    1. Department of Laboratory Medicine and Pathology, University of Alberta Hospitals, Edmonton, Alberta, Canada
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Abstract

Zygosity testing of all multiple births allowed the identification of a subgroup of 42 monozygotic twin pairs who have dichorionic placentas, fused and separate. Perinatal outcomes of this group were compared with 110 pairs of monochorionic monozygotic twins and 148 pairs of dizygotic twins. Dichorionic monozygotic twins had the lowest incidence of preterm birth, perinatal mortality, and birth weight discordance.

There was an excess of like-sexed over unlike-sexed pairs among the dizygotic twins. © 1995 Wiley-Liss, Inc.

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