Quote Originally Posted by Fenix12
If I have a really hard time pulling back on the plunger is that ensuring I haven't hit a blood vessel? It was almost impossible to pull back and the bubbles were so small I could hardly see them. How big are should the bubbles while aspirating be?
When i aspirate the bubbles are not always the same size. sometimes it's kinda hard pulling back on the plunger and sometimes it's easy(could be the angle) But, as stated above until you see red when aspirating you should be fine.

-JJ-