Ob sonogram for dating
Heartbeats are best detected with transvaginal ultrasounds early in pregnancy.
Concern typically develops if there is no fetal heart activity in an embryo with a crown-rump length greater than 5mm.
It may also be possible to determine the gender of your baby during this ultrasound.
Several factors, such as the stage of pregnancy and position of the fetus, will influence the accuracy of the gender prediction.
3-D Ultrasound – Uses specially designed probes and software to generate 3-D images of the developing fetus.
4-D or Dynamic 3-D Ultrasound – Uses specially designed scanners to look at the face and movements of the baby prior to delivery.
The traditional ultrasound procedure involves placing gel on your abdomen to work as a conductor for the sound waves.
Your healthcare provider will use hormone levels in your blood, the date of your last menstrual period and, in some cases, results from an ultrasound to generate an estimated gestational age.Ultrasound dating of conception is not reliable for determining paternity because the ultrasound can be off by at least 5-7 days in early pregnancy.You may have an ultrasound between 18 to 20 weeks to evaluate dates, a multiples pregnancy, placenta location or complications.Fetal Echocardiography – Uses ultrasound waves to assess the baby’s heart anatomy and function.This is used to help assess suspected congenital heart defects.