What are your concerns? What will I learn from a dating scan? Dating scan Print. Your chosen maternity care provider may recommend you have one at 6 weeks if they suspect that your pregnancy is not progressing as it should be. The aim is always to check on the health of you and your baby, but it can sometimes be overwhelming and confusing. A better estimate of due dates can ensure a safer delivery.
The earlier the ultrasound is done, the more accurate it is at estimating the baby's due date.
Ultrasound Accuracy for Predicting Due Dates
However, the accuracy of the ultrasound examination is always dependent on the skill of the sonographer and the quality of the equipment. Because of the risk of redating a small fetus that may be growth restricted, management decisions based on third-trimester ultrasonography alone are especially problematic; therefore, decisions need to be guided by careful consideration of the entire clinical picture and may require close surveillance, including repeat ultrasonography, to ensure appropriate interval growth. Goldberg, MD; and Yasser Y. After 28 weeks, the ultrasound may be off by three weeks or more in predicting a due date. The probe is covered with a disposable protective sheath. Get diet and wellness tips to help your kids stay healthy and happy. Br J Obstet Gynaecol ;