Aspirating

Acer97

Member
I know aspirating isn’t necessary but I’m curious why when I aspirate air bubbles stay in the syringe. Isn’t it in a vacuum state so where is the air coming from?
 
Aspiration is drawing back the plunger once the needle is inserted. How would that affect bubbles already in the syringe?
 
Two possibilities:

-you are using a luer tip and pulling air in (if you are using an insulin syringe this is not an issue)

-you are pulling the plunger back too far, and bubbles are forming in solution due to the high vacuum.
 
I never aspirate. I have tried it a few times. It does look like a bubble can form. I definitely would not be concerned and still inject. That is if there is no blood.
 

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