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Re: [IP] blood in tubing?

> I've seen this too, but it doesn't make sense.  Though it seems clear that
> blood will be available when a small vessel is puntured, it doesn't seem
> reasonable that the blood flows BACK to fill up the cannula.  The syringe
> is rigid and the tubing is pretty stiff--so if  the pump is pushing insulin
> in, does anyone have any idea how the blood moves upstream?
> - -wm


I think you'll find that the fluid moves so slowly in the tube that
there is ample opportunity for 2 fluids to mix, molecule by moecule.
Blood and water have similar specific gravities.

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