Fetal crown—rump length: The information is not a substitute for independent professional advice and should not be used as an alternative to professional health care. Questions to ask your doctor about tests and scans. Ultrasound dating at 12—14 weeks of gestation. But this will only give you a rough idea.
Original date given was 18 December but at the scan it was moved to 31 Dec.
J Womens Health Larchmt ; Dating changes for smaller discrepancies are appropriate based on how early in the first trimester the ultrasound examination was performed and clinical assessment of the reliability of the LMP date Table 1. This is especially true if you have an irregular cycle or have been on the Pill for example. You can estimate the due date of the baby by using our pregnancy calculator. Sonographic prediction of gestational age: A comparison of recalled date of last menstrual period with prospectively recorded dates. Dating scans also reveal other important information such as: