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Related Experiment Videos

Prenatal ages and stages-measures and errors.

R O'Rahilly1, F Müller

  • 1Institut d'Embryologie Spéciale, Université de Fribourg, Fribourg, Switzerland.

Teratology
|April 25, 2000
PubMed
Summary
This summary is machine-generated.

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The term "gestational age" causes confusion in obstetrics and embryology. Abandoning this term and using precise definitions for embryonic and fetal age will improve clarity in prenatal age assessment.

Area of Science:

  • Obstetrics and Gynecology
  • Embryology
  • Prenatal Development

Background:

  • The term "gestational age" is ambiguously used, often conflated with menstrual, postovulatory, or postfertilizational age.
  • While menstrual dating is useful, it is a misnomer as prenatal age spans from fertilization to birth.
  • The term "stage" has a defined embryological meaning and should not be used for age or length estimations.

Purpose of the Study:

  • To clarify the confusion surrounding prenatal age terminology.
  • To advocate for the abandonment of the ambiguous term "gestational age".
  • To promote precise definitions for embryonic and fetal age.

Main Methods:

  • Assessment of embryonic age using 23 internationally recognized morphological stages.

Related Experiment Videos

  • Utilizing measurements for fetal period age assessment due to the absence of a morphological staging system.
  • Critiquing and proposing alternatives for biometric measurements like crown-rump length (CRL).

    • Main Results:

    • Embryonic age is best determined by morphological stages.
    • Fetal age assessment relies on measurements, with "greatest length" (GL) proposed as a replacement for "crown-rump length" (CRL).
    • The term "gestational age" is deemed unnecessary and superfluous.

    Conclusions:

    • Abandoning the term "gestational age" resolves confusion in prenatal age assessment.
    • Implementing precise terminology for embryonic and fetal age enhances clarity in obstetrics and embryology.
    • Standardizing biometric measurements like greatest length (GL) improves accuracy in prenatal assessments.