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What is a normal range for NT measurements?

(5 Posts)
cheeseandmushroomghostie Tue 23-Oct-12 13:36:14

Just had my scan at 13 weeks, and she really struggled to get a 'perfect' measurement due to the way the baby was lying. I know it's combined with blood tests but can anyone tell me what is a normal range for the NT measurements please?

mummytoh1 Tue 23-Oct-12 13:43:26

I believe 'normal range' varies, most hospitals say up to 3.5mm, but it used to be up to 2.5mm. Some private clinics also say up to 2.5mm.

What was your measurement?

cheeseandmushroomghostie Tue 23-Oct-12 14:15:14


mummytoh1 Wed 24-Oct-12 11:51:51

That's a great measurement. DS1 was 1.9mm, DS2 was 2.6mm. Both are fine!

amyboo Wed 24-Oct-12 12:32:22

I've been told to have an amnio with a measurement of 3.2mm. My previous 2 pregnancies all had measurements below 2mm, so I think yours is fine. I think basically anything over 2.5mm is considered at the upper end of normal, over 3mm considered slightly abnormal, and over 3.5mm considered high. Did the sonographer see the nasal bone? That's usually a marker too. Due to the way my baby was lying, we couldn't see it, which I think is another motivation for my doctor recommending an amnio....

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