You need to keep records of patients,  I traveled 1 hour in bad weather to get a dexa scan and when I got there they told me I didn't need one because I had 1 done last year. The receptionist told me when I was making an appointment that she didn't see on file that I had 1 done. No record of my file on her screen. I took public transportation which is 2 hours! I was livid!! Terrible experience. 
IMC MOC MAMMO