Quote Originally Posted by EpiEpee View Post
There are any number of reasons an IV could be used. As somebody pointed out earlier, it keeps an open line for drugs, for taking blood, and for replacing fluids (Blood or saline). It's possible Amy had lost enough blood from her scratches that Tanya was giving her saline or Ringer's solution to replace at least some of her volume. As far as drugs go, some drugs can only be administered by IV or that the only formulations they have left at the colony are IV formulations of drugs that also have an oral form. If they are as low on supplies as indicated before, it seems reasonable to me that they would have used the oral drugs previously, holding onto the IV formulations for a worst case scenario which we are now starting to reach.
Working from memory here, but didn't Michael say "into the tube in her arm" instead of directly mentioning an IV? If so, that could have easily been a hep-lock instead. I've seen people get hep-locks hen the doc/nurse/medic thought that they may need to give injectable drugs or IVs in a hurry at some point. Never put one in or had one, but my ER friends say that they are pretty simple to start.

FWIW.