Originally posted by buffdoc
It's easy to aspirate and inject one-handed in glutes and delts, aspirate with thumb nail. A little flick is all you need, if you aspirate TOO hard, the negative pressure you create can collapse the thin-walled vein around the needle tip, and no blood comes back, you inject IV.
I don't do it with B-12, Human Chorionic Gonadotropin (HCG), stuff like that, but with oil-based gear?! Crazy not to. A big, viscous oil emolism has the potential to kill you. It takes about 5 seconds for that stuff to hit the pulmonary artery. Be careful, it only takes one out of 10,000, half a second is worth it.