With my 20 wk scan I had lots of measurements that said things like leg length 19.5 week , head circ + 21.5 wks and the tech said they select a few key ones to work out your EDD for the scan.
Yes, I'm not sure exactly what the acronym stands for but it is an adjusted EDD based on the ultrasound measurements. This is usually more accurate than based on LMP as you can ovulate early or late. With my first I was due on 15/02 based on LMP but u/s said 10/02. He ended up coming on the 12/02 but had really dry skin and long nails, signs of being "overcooked". This time round I was still bf when I fell pg so had irregular cycles. Based on LMP I would have been due on 04/10/06 (my birthday) but u/s said 19/10. I know this is more likely to be right as I had a BFN when I would have been 4 weeks pg if the LMP date was right.
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