I have to have blood taken a few times a year and usually they can do it on the first or second attempt with a standard needle. However, last time she had to use a butterfly needle and seemed pretty put off by it. What I noticed was that it took a little longer to get the amount of blood that they needed.

I am just guessing here of course, but maybe it is because it takes a little longer and/or they feel "inadequate" because they couldn't do it the normal way. In fact when she could not use a standard needle despite multiple attempts on her side and pain on mine she said "I guess we have to use the needles we use on babies" Thanks for making me feel comfortable