Mass/Time - IV mL Rate Questions
Give an order in quantity of mass per time, determine the necessary IV flow rate in mL/hr based on the given mass per volume. These types of problems are often used in critical care nursing.Formula:
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x | Volume (mL)Vol (mL) | = | Y (Flow Rate in mL/hr)Y (mL/hr) |
Example: Give patient 500 mg of Mockamine in 250 mL of D5W to infuse at 20 mg/hr. Calculate the flow rate in mL/hr.
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x | Volume (mL)Vol (mL) | = | Y (Flow Rate in mL/hr)Y (mL/hr) |
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x | 250 mL | = | 10 mL/hr |
Example: Samplestat at 12.5 mg in 250 mL is prescribed to be infused at a rate of 6 mcg/kg/hr in a patient who weighs 100 kg. At what flow rate in mL/hr will you set the pump?
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x | Volume (mL)Vol (mL) | = | Y (Flow Rate in mL/hr)Y (mL/hr) |
- The first step is to convert the order per time to the amount required for this particular patient. This is a Dosage By Weight Question. 100 kg is the weight in kg and 6 mcg/kg/hr is a dosage in terms of kg.
| Weight in KgWgt (kg) | x | Dosage Per KgDose/kg | = | Y (Required Dosage)Y (Dose) |
| 100 kg | x | 6 mcg/kg/hr | = | 600 mcg/hr |
- mcg → mg → g → kg ( ÷ by 1,000 )
- 600 ÷ 1,000 = 0.6 mg/hr
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x | 250 mL | = | 12 mL/hr |
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