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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Is My 21 Weeks Pregnancy Scan Normal?

Hey, im 21 weeks pregnant and i had my scan yesterday, everything was fit and healthy and normal with him, but his nuchlar fold was measured at 6.4 mm and the sonographer said this is just slightly over what they consider to be normal, she has really worried me and i have to wait another two weeks for a scan with a consultant, there aren't any family members who have downs syndrome, in either sides, i've been reading all morning about different people and their ecperiences and their baby turned out to be fine, when i had my downs syndrome scan/test when i was 12weeks pregannt is came back as i'm in the low risk category, could the chances be that everything is fine?

Tue, 23 Sep 2014
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General & Family Physician,  's  Response
Welcome to health care magic.

1.The nuchal thickness is measured on an axial section through the head and the level of the thalami, cavum septi pellucidum and cerebellar hemispheres (i.e in the same plane that is used to assess posterior fossa structures). One caliper should be placed at the skin, and the other against the outer edge of the bone of the occiput.
2.An abnormal value is one that is more than 6 mm in thickness.
3.A thick nuchal fold is often considered the most sensitive and most specific (best) 2nd trimester marker for Down syndrome with false positive rates as low as 1%.
4.But one thing you have to remember that ultrasound is operator dependent - so possibilities of technical error can be there.
5.So please wait or a doctor to scan after a week or as soon as you can get appointment. Hope the best. Good luck.


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Is My 21 Weeks Pregnancy Scan Normal?

Welcome to health care magic. 1.The nuchal thickness is measured on an axial section through the head and the level of the thalami, cavum septi pellucidum and cerebellar hemispheres (i.e in the same plane that is used to assess posterior fossa structures). One caliper should be placed at the skin, and the other against the outer edge of the bone of the occiput. 2.An abnormal value is one that is more than 6 mm in thickness. 3.A thick nuchal fold is often considered the most sensitive and most specific (best) 2nd trimester marker for Down syndrome with false positive rates as low as 1%. 4.But one thing you have to remember that ultrasound is operator dependent - so possibilities of technical error can be there. 5.So please wait or a doctor to scan after a week or as soon as you can get appointment. Hope the best. Good luck. Hope i have answered your query. Any thing to ask do not hesitate http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888 Thank you.