A comparison of the reliability of the estimated date of confinement predicted by crown-rump length and biparietal diameter

Mazie M. Kopta, Retha R. May, James P. Crane

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    34 Scopus citations

    Abstract

    First trimester crown-rump length (CRL) followed by a second-trimester biparietal diameter (BPD) were sonographically measured in 27 patients. Each value was independently used to prospectively predict an estimated date of confinement. The actual delivery date was compared with the estimated dates of confinement predicted by the CRL and the BPD. The mean error in predicting the actual date of delivery by CRL was 7.73 days as opposed to 7.65 days with the BPD. This difference is not statistically significant (p > 0.9). In both methods there was a greater tendency to overestimate the actual date of delivery. Contrary to widespread belief, the present study shows that a second-trimester BPD is as accurate as a first-trimester CRL in establishing an estimated date of confinement. Additional benefits of second-trimester scanning include the ability to to determine placental localization, evaluate amniotic fluid volume, and exclude many congenital abnormalities.

    Original languageEnglish
    Pages (from-to)562-565
    Number of pages4
    JournalAmerican journal of obstetrics and gynecology
    Volume145
    Issue number5
    DOIs
    StatePublished - Mar 1 1983

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