A client who weighs 154 lb receives a prescription for epoetin alfa 50 units/kg SUBQ 3 times a week. The medication is available in 2,000 units/mL vial. How many mL should the nurse administer with each dose? (Enter numerical value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["0.29"]
Here's how to calculate the volume (mL) of epoetin alfa the nurse should administer for one dose:
1. Convert client weight to kilograms (kg):
Weight (kg) = Weight (pounds) / 2.205
Weight (kg) = 126 pounds / 2.205
Weight (kg) = 57.14 kg (round to two decimal places for better accuracy)
2. Calculate the dose per administration based on weight and prescribed dose:
Dose per administration (units) = Prescribed dose (units/kg) x Weight (kg)
Dose per administration (units) = 50 units/kg x 57.14 kg
Dose per administration (units) = 2857 units (round to nearest whole number)
3. Calculate the volume (mL) to administer for one dose:
Volume (mL) = Dose per administration (units) / Concentration (units/mL)
Concentration (units/mL) = 10,000 units/mL (given on the vial label)
Volume (mL) = 2857 units / 10,000 units/mL
Volume (mL) = 0.2857 mL (round to nearest hundredth as requested)
Therefore, the nurse should administer approximately 0.29 mL of epoetin alfa for one dose.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["83"]
Explanation
Here's how to calculate the infusion pump rate (mL/hour) for the penicillin G administration:
We know:
Total penicillin G dose: 20 million units (given)
Total volume of saline solution: 2 liters (given) = 2000 mL (convert liters to mL)
Penicillin G concentration in saline delivered by pharmacy: 10 million units/liter (given)
We need to find:
Infusion rate (mL/hour)
Steps:
Calculate the concentration of penicillin G in the final infusion solution:
We cannot directly add the penicillin G units to the saline volume because they represent different quantities. Penicillin G is measured in units, while saline volume is measured in liters (or mL).
We need to find the total volume of saline containing the prescribed dose of penicillin G:
We know the total penicillin G dose (20 million units) and the concentration of penicillin G in the saline delivered by pharmacy (10 million units/liter).
Volume of saline containing the dose (liters) = Total penicillin G dose (units) / Concentration of penicillin G in saline (units/liter)
Volume of saline containing the dose (liters) = 20 million units / 10 million units/liter
Volume of saline containing the dose (liters) = 2 liters (This confirms we received the correct concentration from the pharmacy to deliver the prescribed dose)
Correct Answer is ["1.2"]
Explanation
Here's the breakdown of the calculation:
Convert the prescribed dose to milligrams (mg):
We are given the dose in mcg (micrograms). To match the concentration of the medication (mg/mL), we need to convert mcg to mg.
Conversion factor: 1 mg = 1000 mcg
Dose (mg) = Prescribed dose (mcg) / Conversion factor
Dose (mg) = 0.6 mg / 1000 mcg/mg
Dose (mg) = 0.0006 mg (convert to mg for easier calculation)
Calculate the volume to administer:
We know the dose (mg) and the concentration (mg/mL) of the medication in the vial.
Volume (mL) = Dose (mg) / Concentration (mg/mL)
Volume (mL) = 0.0006 mg / (500 mcg/mL) (convert mcg/mL to mg/mL for consistency)
Volume (mL) = 0.0006 mg / (0.5 mg/mL)
Volume (mL) = 0.0012 mL (round to one decimal place as appropriate for medication administration)
Adjust for unit size:
The medication vial contains 2 mL, and we calculated a volume of 0.0012 mL.
However, it's not possible or safe to administer such a small fraction of the vial content.
In practice, the nurse would need to administer the smallest measurable volume possible using this specific vial.
Since the vial contains 2 mL, 1.2 mL is the lowest whole number volume that can be accurately measured and administered from this vial.
Therefore, while the calculated dose based on the prescribed amount is 0.0012 mL, the nurse should administer 1.2 mL from the available 2 mL vial.
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