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    • Obstetric and Gynecologic - Pregnancy Gestation by LMP and Ultrasound Biometry

    Pregnancy Gestation by LMP and Ultrasound Biometry

    Input:
    Current Date   
    Last Menstrual Period   
     
    Ultrasound Estimation:
    Ultrasound Date   
     
    1st Trimester Measurement
    Crown Rump Length
     
    2nd and 3rd Trimester Measurements
    Biparietal Diameter
    Head Circumference
    Results:
    Gestation by LMP
    EDC by LMP
    Gestation by CRL
    EDC by CRL
    Gestation by BPD
    EDC by BPD
    Gestation by HC
    EDC by HC
     
    • This calculator gives you many options for estimating gestation and delivery dates. Input any or all parameters to compare the various date calculations. The Current Date is set to your local workstation date.
    • EDC by LMP is calculated by adding 280 days (40 weeks) to the first day of the last menstrual period.
    • Gestation by LMP is calculated from the first day of the last menstrual period.
    • Gestation by CRL is calculated: Weeks = 5.2876 + (0.1584 * Crown_Rump_Length) - (0.0007 * Crown_Rump_Length2). This will be gestation at time of ultrasound.
    • Gestation by BPD is calculated using the formula: Days = 2 * BPD + 44.2. This will be gestation at time of ultrasound.
    • Gestation by HC is calculated: Weeks = eTo(1.854 + (0.010451 * Head_Circumference) - (0.000029919 * Head_Circumference2) + 0.000000043156 * Head_Circumference3). This will be gestation at time of ultrasound.
    • N.B. CRL dates are appropriate for the first trimester, while BPD and HC dates are best applied to the second trimester.
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