The extent and antecedents of uncertain gestation

Br J Obstet Gynaecol. 1985 May;92(5):445-51. doi: 10.1111/j.1471-0528.1985.tb01347.x.


The extent and genesis of uncertainty of gestation has been studied in a total obstetric population, using in all cases a best clinical estimate of gestation made according to a specific protocol. In 73.2% of patients, the estimate was assessed as certain, in 19.7% as approximate, and in 7.1% as uncertain. Uncertainty assessed in this way has several antecedents, and coding of only of these (presence or absence of a precise date for the last menstrual period) is insufficient in data to be used for research in which gestation length is to be used as a variable.

MeSH terms

  • Adolescent
  • Adult
  • Contraceptives, Oral
  • Education
  • Female
  • Gestational Age*
  • Humans
  • Illegitimacy
  • Infant Mortality
  • Infant, Newborn
  • Maternal Age
  • Menstruation Disturbances
  • Parity
  • Pregnancy
  • Smoking
  • Social Class


  • Contraceptives, Oral