Med-Math Dosage Calculations Practice Test

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A unit of 250 mL packed red blood cells to infuse over 4 hours with a drop factor of 10 gtt/mL. What is the IV flow rate in mL per hour?

50 mL/hr

63 mL/hr

When figuring IV flow rate in mL per hour, you divide the total volume to be infused by the infusion time. Here, 250 mL over 4 hours gives 250 ÷ 4 = 62.5 mL/hour. We typically round to a whole number, so 63 mL/hour. The drop factor (10 gtt/mL) would matter only if you needed drops per minute (gtt/min), not the mL per hour here.

75 mL/hr

100 mL/hr

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