Pregnancy Gestation by LMP and Ultrasound Biometry

Input:

 Current Date Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec MM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 DD 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 YYYY Last Menstrual Period Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec MM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 DD 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 YYYY Ultrasound Estimation: Ultrasound Date Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec MM 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 DD 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 YYYY 1st Trimester Measurement Crown Rump Length cm ft in micm mm m nm yd 2nd and 3rd Trimester Measurements Biparietal Diameter cm ft in micm mm m nm yd Head Circumference cm ft in micm mm m nm yd

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

Notes
• 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.

References
1. Mul T, Mongelli M, Gardosi J. A comparative analysis of second-trimester ultrasound dating formulae in pregnancies conceived with artificial reproductive techniques. Ultrasound Obstet Gynecol. 1996 Dec;8(6):397-402. PubMed ID: 9014279
2. Westerway SC, Davison A, Cowell S. Ultrasonic fetal measurements: new Australian standards for the new millennium. Aust N Z J Obstet Gynaecol. 2000 Aug;40(3):297-302. PubMed ID: 11065037
3. Altman DG, Chitty LS. New charts for ultrasound dating of pregnancy. Ultrasound Obstet Gynecol. 1997 Sep;10(3):174-91. PubMed ID: 9339525

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