Nuchal translucency measurements?

BAM • 🦊 3.29.18 💜

so I had the test done last week (ultrasound and blood) and I got some general notes given to me on my online account.

one of them being "Nuchal translucency examination was performed and

measures 1.5 mm"

anyone know what the "normal" measurement is?

or what CRL is?

" CRL: 70.4 mm "

my appointment is next week and I know my doctor will go over everything. but I'm a nervous Nelly and hate getting things like this sent to me!