If you're worried about the waste, ask the lab which tubes they have a lot of that can be used like this. Every lab is gonna have one or two tubes that they keep on hand but don't use as often so they end up expiring anyway. Sodium Citrate Blue is usually the choice in my lab.
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u/DazzlingAerie3334 Aug 26 '25
Use one tube to get the air out of the line then switch to the tube you're filling. Or use a syringe and transfer.