How far back do you pull the plunger when

normally , till the tiny bubble turns a little bigger ... and ofcourse , always aspirate . and blood ? pull out and inject elsewhere bro .
 
just enough to make the tiny bubble in the tip... if you pass through a vein you might fill the tip even without aspirating and if in a vein like I was tonight even before I aspirated I had a blood bubble inside the needle... I just shoot the blood in the sink and stick in a new spot.. go figure I can shoot vet gear but I have a problem shooting my own blood back into my ass :)
 
Little bubbles and then you stop, never really looked to see how far I pulled back. If your in a vein you know it. You'll pull back and blood will fill up like you were drawing the gear initially.
 
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