I injected 23 IU of Lantus this morning in one site (I do two sites of 23 each) and held the needle in for ten seconds, pulled it half-way out and held it there for another ten seconds, pulled out the needle and then...watched a HUGE bead of almost-clear (very slightly tinged with blood) Lantus come right back out again.
I put on my scientist hat and drew the bubble into an empty syringe to measure it: NINE units. Almost half the dose.
Sometimes I go days without a “pop out” and then this. I think my technique is about the same each time. I try to move my sites around every, single time.
Oh well, I injected eight clean units at a third site and shrugged my shoulders.