This 13 week anatomy scan provides an opportunity to assess the anatomy of the baby. The scan is performed between 12 weeks 2 days and up to 15 weeks.
The 13 week anatomy scan is often referred for when a Non-Invasive Prenatal Testing (NIPT) blood test, commonly known as the Harmony Prenatal Test or NEST, has been undertaken for first trimester screening.
In most cases the scan will be performed transabdominally, but there are some situations where a transvaginal (internal) ultrasound may be necessary. Transvaginal ultrasound involves inserting a thin transducer (ultrasound probe slightly thicker than a tampon) into the vagina to get more detailed images as the transducer is closer to the pelvic organs. This improves the accuracy of diagnosis.
Transabdominal and transvaginal ultrasound examinations are safe at all stages of pregnancy.
Before your scan
Ideally, please call to book your appointment as early in the pregnancy as possible, so that the procedure can be done during the suggested period.
If possible, please wear comfortable, loose-fitting clothing that allows easy access to the area that is being imaged. Two-piece clothing is ideal (separate upper/lower garments).
Please empty your bladder 2 hours before the examination time. Then slowly drink 600ml of water to fill your bladder and keep it full for your examination.
About the 13 Week Anatomy Scan procedure
When you visit Adelaide Women’s Imaging for a 13 week anatomy scan you will be greeted by one of our friendly reception staff. A sonographer will then collect you from the waiting room and take you to the ultrasound room. The sonographer will perform an ultrasound of the abdomen (transabdominal ultrasound) detailing the fetal anatomy and maternal pelvic anatomy.
Occasionally, the scan may need to be performed through the vagina (transvaginal imaging). Transvaginal ultrasound involves inserting a thin transducer (ultrasound probe slightly thicker than a tampon) into the vagina to get more detailed images as the transducer is closer to the pelvic organs. The transducer is lubricated with gel before insertion into the vagina. It is disinfected, and a protective cover is placed over the transducer each time it is used, so there is no risk of infection. This improves the accuracy of diagnosis and greater detail may be obtained of the fetal anatomy.
The Adelaide Women’s Imaging doctor will discuss the results of the scan with you on the day in the ultrasound room. A detailed report will be sent to your referring doctor.
Duration of Scan
Approximately 40 minutes.