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duality 2 points ago +4 / -2

“Volume of fluid left in a syringe after the plunger has been pushed down completely.”

In other words, you can’t get it out by depressing the plunger, which is what the nurse did in the video.

CannonballJunior 1 point ago +2 / -1

The 2nd time, after drawing back the plunger.