Rationale
There are 29 days' supply of NPH U-100 insulin in a 10 mL vial when dispensed at 17 units b.i.d.
To determine the days' supply, we first calculate the total units in the vial and then divide by the daily usage. Since NPH U-100 insulin contains 100 units/mL, a 10 mL vial contains 1,000 units. The patient requires 34 units per day (17 units b.i.d.), leading to a total of 29 days' supply.
A) 6
This choice is incorrect because 6 days' supply would imply that only 204 units are used, which is significantly less than the total available units in the vial. At a dosage of 34 units per day, the vial would last much longer than just 6 days.
B) 15
Choosing 15 days' supply suggests a total consumption of 510 units. However, with a daily requirement of 34 units, the vial would last well beyond this estimate, as it contains 1,000 units. Therefore, 15 days does not represent a realistic calculation based on the prescribed dosage.
C) 29
This is the correct answer because it accurately reflects the total days' supply derived from the calculation. With 1,000 units available and a daily requirement of 34 units, the patient will have enough insulin for 29 days.
D) 59
This option is incorrect as it implies that the patient would use only 17 units per day, which is inconsistent with the provided b.i.d. dosage of 34 units daily. If the patient were to use insulin for 59 days at that rate, it would require 2,006 units, exceeding the amount available in the vial.
Conclusion
Calculating the days' supply of medication is crucial for patient care and ensures that the patient has enough insulin while adhering to their prescribed dosage. In this scenario, with a total of 1,000 units available and a daily consumption of 34 units, the vial will last for 29 days, providing the necessary supply for the patient to manage their condition effectively.
