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Transvaginal ultrasound can see embryonic development about a week before transabdominal ultrasound, the American Pregnancy Association (APA) states.A transducer, a wand-shaped probe, is inserted into the vagina and pressed against the vaginal walls directly next to the uterus.A positive fetal heartbeat at this stage indicates a 95 percent chance that the pregnancy will proceed normally, according to Dr. Early transvaginal ultrasound, the most reliable way to determine a pregnancy due date, can date a pregnancy within a few days and is more accurate than determining a due date by the date of the last menstrual period.Pregnancy ultrasounds are performed mainly using transabdominal ultrasound.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.
A small amount of ultrasound gel is put on the skin of the lower abdomen, with the ultrasound probe then scanning through this gel.For many women, especially after 8 weeks gestation, sufficient information about the baby may be obtained with transabdominal ultrasound only.However, in the early pregnancy, the developing embryo is very small (at 6 weeks gestation, the baby is only 5-9mm long) and a transvaginal ultrasound may be required to get a better image of the baby.Please empty your bladder 1 hour before your appointment, drink 2 glasses of water and try not to empty your bladder again until after your appointment.A full bladder moves bowel out from the pelvis into the abdomen, helping visualisation of the pregnancy, uterus and ovaries.
If you have concerns about transvaginal ultrasound, please discuss this with your sonographer before your ultrasound begins.