"Sex determination of the fetus can be done accurately by 15 weeks by expert ultrasound at our office in most cases, and as early as 14 weeks in some cases. This can sometimes be helpful in ruling in or out some diseases that are sex-linked. The sex of the fetus is also accurately determined if a patient undergoes a CVS at 10-11 weeks or an amniocentesis at 15-16 weeks"
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