Ultrasound Question?

I am 33w1d pregnant and had an appt. with my Dr. on Wed. & at that time I was measuring exactly what I should have been. The dr. said she was going to order an ultrasound just to double check the growth of the baby. On the paper she checked off "Interval Growth" for Ultrasound Request. But on the very bottom of the page it says Indication for testing and she wrote "SCD" I've looked online for that and all I found was Spondylocostal dysostosis (SCD)....could that mean that my baby has that?? I've had 2 previous US's one of which was a Level II and even a consultation with a perinatologist and he said everything was perfectly normal. There is nothing wrong with my medical history. I am a normal, healthy 23 year old. I'm just worried about the indication for testing. If anyone has any insight on this please let me know. Thanks