I work in a radiology department and we have to start IV for pts for CT with IV contrast all the time. I used ultrasound today and started an IV for a pt in the right upper arm, I used 20 GA 1.88 INCH BD Insyte Autoguard. I found a large basilic vein under ultraound,it was 5Â cmÂ above the elbow andÂ about 2Â cm below skin. There was no artery around and I poked the pt with the needle and I saw the needle went through the vein in the ultrasound screen and I saw blood return in the catheter immediately. I lowered the catheter and advanced it in with no resistence. I flushed the IV with 10 ccÂ normal saline. The flush went well and when I withdrew, I got niceÂ blood return. Pt felt happy that I only used 2 minutes and gave him a good IV. But when pt went to CT scan, the Tech did the injection, there was no contrast in the CT picture. So where does thoese contrast go? Pt didnt feel any pain or discomfort in the right upper arm and I flushed with 10CC normal saline flush twice and it went in smoothly, no problem. I dont understand,Â everything looksÂ ok butÂ no contrast showed up in the CT scan. I had this kind of situation before. When I started the IV under ultrasound, everything was ok, I got nice blood return and flushed well, but when pts went to CT Scan, pt IV infiltrated. But I used long needle, 20GA 1.88 INCH. That is longer than normal IV needle and the vein was justÂ 2cm under the skin. So I dont understand what I did wrong. How can I improve my PIV under ultrasound? I am really confused. But sometimes I started IV under ultrasound, the techs did the CT angio for the pts withÂ that PIV, it went well. So I got mixed results for my ultrasound PIVs.Â Can the experts here give me some advice or suggestions? I want to give the pts good IV access so that they can have the test done,how can I improve myself? Any of your inputs will highly appreciated!!