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A soft marker is a small finding on ultrasound that is not, by itself, a birth defect or a structural problem. It is usually a minor, harmless variation in how part of the baby’s body looks on the scan, something like a tiny bright spot in the heart or a small amount of extra fluid in a kidney. On their own, soft markers do not cause any health problem for the baby and often disappear later in the pregnancy or go completely unnoticed after birth.
The reason your sonographer or doctor mentioned it is that certain soft markers were found, in older research, slightly more often in babies who also had an extra or missing chromosome, a change called an aneuploidy. Down syndrome, caused by an extra copy of chromosome 21, is the aneuploidy most people think of, but soft markers have also been studied in connection with trisomy 18 and trisomy 13. Because of this old association, ultrasound reports are trained to flag soft markers so that your care team can factor them into your overall picture, alongside any blood or genetic screening you have already had.
It is important to understand that soft markers are common. Most babies with a soft marker have completely typical chromosomes, and the marker itself is simply a normal variation. The finding is a piece of information to be considered in context, not a diagnosis and not, on its own, a reason for alarm. How much weight it should carry depends heavily on what other testing you have already done, which the next questions in this document walk through.
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