Baby dating ultrasound

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Screening for Down's syndrome will happen at the dating scan if: The screening test for Down's syndrome used at this stage of pregnancy is called the combined test.

The combined test involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.

If the pregnancy is more than 7 weeks it may be possible to see enough abdominally (tummy scan), sometimes both scans are necessary to ensure all is well.

Please be aware that if your pregnancy is not progressing as planned or if an abnormality is detected during the scan, the results will be discussed with you immediately following your scan and a plan of action advised.

Most dating scans are done with a trans-abdominal transducer and a fullish bladder.

If the pregnancy is very early the gestation sac and fetus will not be big enough to see, so the transvaginal approach will give better pictures.

Advanced Ultrasound – This exam is similar to the standard ultrasound, but the exam targets a suspected problem and uses more sophisticated equipment.

Doppler Ultrasound – This imaging procedure measures slight changes in the frequency of the ultrasound waves as they bounce off moving objects, such as blood cells.

the baby and its heart beat can be detected relatively easily with trans-abdominal and trans-vaginal examination.

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