well i knew i had heard what the red and blue is... but i wanted to find confirmation... so i did a little googling...
http://www.medterms.com/script/main/...ticlekey=18180
Quote:
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The direction of blood flow is assigned the color red or blue, indicating flow toward or away from the ultrasound transducer.
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so... all the red and blue means is that there was an area with blood flowing that you saw on the screen. I dont see why the ultrasound operator couldnt tell you that red and blue is blood flowing... but i guess rules are rules...