You're Sticking it Where??

While chatting with someone I know about her new physician placement in women's health, she mentioned that she needed to put an IV into a patient that day. Thinking back to my recent doctor-shadowing, I said "oh, is that done in the same way as drawing blood?" She gave me a strange look and a moment later I understood why when she said "um.. Rachel... IUDs get inserted through the vagina.. not the arm".. and I realized I had misheard "IUD" as "IV". Whoops.

(I then told her that, for the record, I had learned about IUDs back in grade 9 health class since I attended a public school and received a broad education..)