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How many units on a 0.5 mL insulin syringe is a 2 mg dose at 4 mg/mL?

Asked 12 Feb 2026Modified 6 months agoViewed 819 times
This question was marked as a duplicate of How many units on a 0.3 mL insulin syringe is a 5 mg dose at 20 mg/mL?Closed 13 Mar 2026. It remains here because the answers below are specific to how it was asked.
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Concretely: a 0.5 mL insulin syringe · 2 mg · 4 mg/mL.

I want the working, not the result — I need to be able to redo it with different numbers.

I care about the precision as well as the value — I want to know how many figures are real.

How many significant figures are actually justified here?

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askedpascal_thibault11k1712 Feb 2026
8Add whether the needle is fixed or detachable — the dead space differs by an order of magnitude. – juan_esquivel 5 hours ago
How many draws are you planning from the vial? That decides which diluent to use. – Dr_Signe_Baldursdottir 2 months ago
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