The vial which the nurse should use to administer the least volume into the injection site is: 10,000 unit vial.
Discussion:
A vial otherwise known as a flacon may be a small glass or plastic vessel or bottle, often used to store medication as liquids, powders or capsules.
Since the other says; Administer Heparin 6,200 units subcut now.
We can conclude that the vial which the nurse should use to administer the least volume into the injection is; 10,000 unit vial.
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