Which of the following is a correct expression for the rate in mL/min for an infusion of 400 mL over 8 hours?

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Study for the Archer Pharmacology Test to master dosage calculations and medication administration. Use flashcards and multiple choice questions with detailed explanations. Get ready for your exam!

Multiple Choice

Which of the following is a correct expression for the rate in mL/min for an infusion of 400 mL over 8 hours?

Explanation:
Rate is volume divided by time. To get mL per minute, convert the time to minutes: 8 hours × 60 minutes/hour = 480 minutes. Then 400 mL ÷ 480 minutes = 0.833... mL/min, which rounds to 0.83 mL/min. If you check by converting to mL/hour first (400 mL ÷ 8 h = 50 mL/hour) and then to minutes (50 ÷ 60 ≈ 0.833 mL/min), you arrive at the same value. The correct expression is 0.83 mL/min.

Rate is volume divided by time. To get mL per minute, convert the time to minutes: 8 hours × 60 minutes/hour = 480 minutes. Then 400 mL ÷ 480 minutes = 0.833... mL/min, which rounds to 0.83 mL/min. If you check by converting to mL/hour first (400 mL ÷ 8 h = 50 mL/hour) and then to minutes (50 ÷ 60 ≈ 0.833 mL/min), you arrive at the same value. The correct expression is 0.83 mL/min.

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