Ultra Sound

I went to a radiology diagnostics center near Columbus Circle for my first ever diagnostics procedure involving a machine other than an xray. I was getting an abdominal ultrasound. I was up early for my 8 AM appointment and hadn't eaten since 10 PM. I could feel my hunger pangs and some residual abdominal muscle pains from an abs workout last Saturday. Anyway, I was called by the technician, a female who seemed to be of Eastern European descent, at promptly 8. She directed me to a small changing room filled with hospital gowns. I heard she said "Take everything off and put the gown on with the opening on the front." She proceeded to the examination room while I dropped my jacket, my bag, and started to undress.  But I was hesitant to take my underwear off. I wondered to myself why I needed to be naked when I'm only getting an abdominal ultrasound. As I was pondering, she called if I was ready. Then I popped the question, "Do I really need to take my underwear off?" With a matter-of-fact look, she said, "Everything from the waist up." Yikes! "Oh, I didn't hear the 'waist up' part. My bad." Why didn't I hear the 'waist up' part from her directions is beyond me. I hurriedly put my jeans back on and scrambling to put on my sneakers as she sits somewhat impatiently and looking at my embarrassed self. I listened carefully to her every word from then on.