The nurse is reconstituting a powdered medication that is labeled, "Add 2.5 mL of normal saline to make 1 gram per mL." The dient's prescription is for 500 mg of the medication. How many mL should the nurse administer to this client? (Enter numeric value only. If rounding is required, round to the nearest tenth.)
The Correct Answer is ["0.5"]
Here's how to calculate the volume the nurse should administer after reconstituting the medication:
1. Reconstitution and Concentration:
The medication label states adding 2.5 mL of normal saline will make a solution with a concentration of 1 gram per mL. This means after reconstituting, each 1 mL of the solution will contain 1 gram of medication.
2. Dose conversion:
The client's prescription is for 500 mg. We need to convert it to grams since the concentration is in grams per mL.
Conversion: 1 gram (g) = 1000 milligrams (mg)
Prescribed dose (g) = 500 mg / 1000 mg/g
Prescribed dose (g) = 0.5 g (round to nearest tenth)
3. Calculate the volume to administer:
We know the concentration after reconstitution (1 gram/mL) and the desired dose in grams (0.5 g).
Volume to administer (mL) = Dose (g) / Concentration (g/mL)
Volume to administer (mL) = 0.5 g / 1 g/mL
Volume to administer (mL) = 0.5 mL (round to nearest tenth as requested)
Therefore, the nurse should administer approximately 0.5 mL of the reconstituted medication to the client.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["31"]
Explanation
Here's how to calculate the infusion rate (gtt/min) for the nurse to regulate:
1. We know the following:
Total vancomycin dose: 1500 mg
Volume of solution: 250 mL
Infusion time: 2 hours
IV administration set gtt/mL: 15 gtt/mL
2. We need to find the infusion rate in gtt/min.
Steps:
a. Calculate the concentration of vancomycin in the solution:
Concentration (mg/mL) = Total dose (mg) / Volume (mL)
Concentration (mg/mL) = 1500 mg / 250 mL
Concentration (mg/mL) = 6 mg/mL (round to nearest whole number)
b. Convert infusion time from hours to minutes:
Infusion time (minutes) = Infusion time (hours) x Minutes per hour
Infusion time (minutes) = 2 hours * 60 minutes/hour
Infusion time (minutes) = 120 minutes
c. Calculate the total volume of solution to be infused per minute:
Total volume rate (mL/min) = Total volume (mL) / Infusion time (minutes)
Total volume rate (mL/min) = 250 mL / 120 minutes
Total volume rate (mL/min) = 2.083 mL/min (round to nearest hundredth)
d. Finally, calculate the infusion rate in gtt/min:
Infusion rate (gtt/min) = Volume rate (mL/min) x gtt/mL
Infusion rate (gtt/min) = 2.083 mL/min * 15 gtt/mL
Infusion rate (gtt/min) = 31.25 gtt/min (round to nearest whole number as requested)
Therefore, the nurse should regulate the infusion at approximately 31 gtt/min.
Correct Answer is ["4.8"]
Explanation
The vial is labeled as “100 mg per 4 mL.”
This means that each mL contains 25 mg of the medication (100 mg / 4 mL = 25 mg/mL).
The nurse needs to administer 120 mg of the medication.
To find out how many mL this is, we divide the dose by the concentration:
VolumeinmL = 120mg / 25mg/mL = 4.8mL
If rounding is required to the nearest tenth, the nurse should administer 4.8 mL of the medication.
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