PREGNANCY-BIRTH Messages for February, 2002: Nuchal Fold, Femur Length, Umbilical Cord

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Nuchal Fold, Femur Length, Umbilical Cord

From: Ed (anonymous@obgyn.net)
Sun, 24 Feb 2002 22:03:20 -0600 (CST)

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My wife is in the beginning of her 2nd trimester. During our last visit to the Gynae at 14 weeks, he took a measurement of our baby's nuchal fold and was initially concerned with what he perceived was the NT. After some searching and scanning using the colour doppler, he found it to contain blood movement (red on the left and blue on the right - he explained that that showed blood moving in a loop - towards the scanner on the left (red) and away from it on the right (blue) and that this showed that it is probably the umbilical cord looped behind the baby's neck; thus indicating a false thickness on the back of his neck).

He then took a second NT measurement of 2.1mm and told us that it was fine. I have complete confidence in our gynae but his initial reaction gave us quite a shock and I have been reading up on Nuchal Fold Thickening ever since. He made no comment regarding the measurement of our baby's femur (i'm assuming that's the thigh bone) length though. My concerns however are:

1. Do all foetuses have NT? If so, what is a 'normal' thickness. Is there a table that provides details of thickness according to the foetus' age?

2. Is the thickness supposed to increase or decrease with the foetus' age?

3. Is there any danger of the umbilical wrapping itself around the baby while being so close to his neck?

We would appreciate any response to our queries - it's gonna be another 3 weeks before our next appointment and the worry is driving us up the wall.

Thanks in advance

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