72. An order for furosemide 120 mg IV STAT will be dispensed using furosemide 40 mg/2 mL. What volume in mL of the stock injection will be required to deliver the requested dose?
Answer: C
The required volume of furosemide stock injection to deliver 120 mg is 6 mL.
To deliver a dose of 120 mg of furosemide using a concentration of 40 mg per 2 mL, a total volume of 6 mL is needed to achieve the desired dosage.
A) 1
This option is incorrect because 1 mL of the furosemide solution would only provide 20 mg of the medication (40 mg/2 mL). This volume is insufficient to meet the required 120 mg dosage.
B) 3
This option is also incorrect as 3 mL of the furosemide solution would yield 60 mg of the medication (40 mg/2 mL). This amount is still below the needed dose of 120 mg.
C) 6
This is the correct option. To calculate the necessary volume, we can determine how many milliliters are needed to obtain 120 mg: (120 mg) / (20 mg/mL) = 6 mL. Thus, 6 mL of the stock solution is required.
D) 12
This option is incorrect because 12 mL of the furosemide solution would deliver 240 mg of the medication (40 mg/2 mL). This volume exceeds the required 120 mg dose by a significant margin.
Conclusion
The correct answer is 6 mL, as it provides the exact amount of medication needed for the order. All other options either fall short or exceed the required dosage, demonstrating a misunderstanding of the dosage calculation based on the provided concentration.