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 volume required to deliver the requested dose of furosemide is 6 mL.
To administer 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 correct dosage.
A) 1
Selecting 1 mL of the furosemide stock would only provide 20 mg of the medication, which is significantly lower than the required 120 mg dose. Therefore, this option is incorrect.
B) 3
Choosing 3 mL would yield 60 mg of furosemide, still not meeting the required dose of 120 mg. This option is insufficient for the order and is therefore incorrect.
C) 6
The correct calculation shows that 6 mL will provide the necessary 120 mg dose, as 6 mL of a solution containing 40 mg/2 mL equals 120 mg. This makes this option the correct choice.
D) 12
Selecting 12 mL would provide 240 mg of furosemide, which exceeds the required dose of 120 mg. This option is also incorrect as it results in an overdose.
Conclusion
The correct answer is 6 mL, as this volume accurately delivers the required 120 mg dose of furosemide. Options A, B, and D fail to provide the correct amount, with A and B being too low, and D being an overdose. Thus, C is the only option that fulfills the dosage requirement accurately.