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Once the fetal pole is seen, the crown-rump length (CRL) of the embryo can be measured. Once the CRL reaches 5 millimeters, the heartbeat should appear, the APA states.This occurs normally between 6 and 7 weeks of pregnancy.
Some sonographers believe that at seven weeks of gestation, transvaginal ultrasound provides the best and most accurate visualisation.
A registered nurse with more than 25 years of experience in oncology, labor/delivery, neonatal intensive care, infertility and ophthalmology, Sharon Perkins has also coauthored and edited numerous health books for the Wiley "Dummies" series.