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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Is Small Head Size Of Fetus Sign Of Downs Syndrome?

I have just had a 23 week sccan and the baby s head measured small in the bottom 5 percentile at 198.6mm. The BPD was 55.4, AC 182.8 and FL 38.1. The tummy is the only part that is showing on track, although the head measurment is the most worrying. The baby presented in the breech position and my doppler results were RI 0.58 and my RI 0.77 and the cerebral artery was PI 1.26. Its all very worrying. I have a 0.83 percent chance that my baby has downs. Is this confirmation of this fact with the head and femur measurement? Could it be another disorder or is it restricted growth? I am being seen for another scan in 3 weeks which seems so long away. Thank you
Sat, 10 Sep 2016
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Pediatrician,  's  Response
diagnosis of down syndrome prenataly includes the measurement of something called Nuchal translucency it's Measured around the 20th week of gestation , serum levels of inhibin, B-HCG , alpha feto protein , and estradiol are very helpful
microcephaly (small sized head ) alone is not diagnostic of down syndrome , it's associated with a lot of disorders which is best diagnosed postnataly.
I hope your child has nothing of these disorders
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Is Small Head Size Of Fetus Sign Of Downs Syndrome?

diagnosis of down syndrome prenataly includes the measurement of something called Nuchal translucency it s Measured around the 20th week of gestation , serum levels of inhibin, B-HCG , alpha feto protein , and estradiol are very helpful microcephaly (small sized head ) alone is not diagnostic of down syndrome , it s associated with a lot of disorders which is best diagnosed postnataly. I hope your child has nothing of these disorders I hope this answers your question