A drug is supplied as 0.5 mg/mL. The order is 2 mg. How many mL to administer?

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Multiple Choice

A drug is supplied as 0.5 mg/mL. The order is 2 mg. How many mL to administer?

Explanation:
Understanding how to convert a dose to a volume is key. Volume to administer equals the ordered dose divided by the concentration. Here, the drug is 0.5 mg per mL, and the ordered dose is 2 mg. So, volume = 2 mg ÷ 0.5 mg/mL = 4 mL. Sanity check: 4 mL × 0.5 mg/mL = 2 mg, which matches the order. Therefore, 4 mL is the correct amount to give. If you used 2 mL, you’d give 1 mg; 1 mL would be 0.5 mg; 8 mL would be 4 mg.

Understanding how to convert a dose to a volume is key. Volume to administer equals the ordered dose divided by the concentration. Here, the drug is 0.5 mg per mL, and the ordered dose is 2 mg. So, volume = 2 mg ÷ 0.5 mg/mL = 4 mL. Sanity check: 4 mL × 0.5 mg/mL = 2 mg, which matches the order. Therefore, 4 mL is the correct amount to give. If you used 2 mL, you’d give 1 mg; 1 mL would be 0.5 mg; 8 mL would be 4 mg.

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