Obstetrics & Gynecology 2000, 95 (6):867-873

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Increased Adverse Pregnancy Outcomes With Unreliable Last Menstruation
 Tạp chí Obstetrics & Gynecology 2000 December 2,1999; 95 (6):867-873
 Tác giả   TRI HUU NGUYEN, MD, TORBEN LARSEN, MD, GERDA ENGHOLM, MSc and HENRIK MØLLER, MSc
 Nơi thực hiện   Department of Ultrasound, Herlev Hospital University of Copenhagen, Herlev, Denmark
 Từ khóa   Pregnancy,
  DOI   URL  PDF

English

Objective: To estimate the risk of adverse outcomes in women whose first day of the last menstrual period (LMP) was unreliable.

Methods: Among 20,244 singleton pregnancies with measurements of biparietal diameter between 12 and 22 weeks’ gestation, LMP was registered as unreliable in 3775 (18.6%) and reliable in 16,469 (81.4%). Adverse outcomes were defined as spontaneous or missed abortions after 12 weeks’ gestation, stillbirth or postnatal death within 1 year, preterm birth, birth weight less than 2500 g, and low birth weight (LBW) for gestation (lower than 22% below sex-specific expected weight). Logistic regression analysis and Kaplan-Meier survival analysis were used to analyze the risk of adverse outcomes.

Results: The risk of death was doubled in pregnant women with unreliable LMPs compared with those with reliable LMPs (odds ratio [OR] 2.0; 95% confidence interval [CI] 1.5, 2.6). This risk was highest with respect to stillbirth (OR 2.7; 95% CI 1.7, 4.3). The risks of preterm birth, LBW, and LBW for gestation were also significantly increased (ORs 1.5, 1.4, and 1.2; 95% CIs 1.3, 1.7; 1.2, 1.6; and 1.0, 1.4, respectively).

Conclusion: An unreliable LMP is associated with increased risk of adverse outcomes, especially fetal death.

Unreliable first day of the last menstrual period (LMP) is common. It has been reported with varied frequencies (10–44.7%) depending on the population studied and criteria used.1–4 The LMP is normally considered unreliable if a woman reports irregular menstrual cycles, conception within 3 months of stopping oral contraceptives (OCs), or uncertainty about the LMP.3 Previous studies found that an unreliable LMP was associated with high rates of low birth weight (LBW), low socioeconomic status, and high rates of preterm delivery.5–7 In the present study, we tested the hypothesis that women with unreliable LMPs might have increased risks of late abortion, stillbirth, postnatal death within 1 year, preterm birth, and LBW.

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