This is a scan done early in pregnancy before 12 weeks of gestation. It confirms the presence of fetal heartbeat normally at 6 weeks from the last menstrual The dating is most accurate when the scan is performed between 7-11 weeks.
Week 8 of your Pregnancy with Advice by Obstetrician Dr Gibb
First trimester Ultrasound Sonogram Scans week by week early scan months 1 2 3 Thus, a simple and accurate way to "date the fetus" in an early pregnancy is to With high-resolution, the heartbeat is seen as a regular flutter in the embryo, minus 6 days, and it is most accurate between 7 and 10 weeks of pregnancy.
First-Trimester Ultrasound: A Comprehensive Guide - Google Books Result
Diagnostic Ultrasound in the First Trimester of Pregnancy | GLOWM