How it Works
Try Naxlex NCLEX-RN (Free-Trial)

A doctor orders Vancomycin 500 mg to infuse at 5 mg/kg/hr. The patient weighs 98 lbs. You are supplied with a 500 mg/100 mL bag. How many mL/hr will you administer? (Round your answer to the nearest tenths)

A.

44 mL/dose

B.

44.5 mL/hr

C.

44.50 mL/dose

D.

44 units

Answer and Explanation

The Correct Answer is B

Given:

Ordered dose of Vancomycin: 500 mg

Infusion rate: 5 mg/kg/hr

Patient weight: 98 lbs

Concentration of Vancomycin: 500 mg/100 mL

 

Step 1: Convert patient weight from pounds to kilograms:

1 pound (lb) = 0.453592 kilograms (kg)

Patient weight in kg = 98 lbs x 0.453592 kg/lb = 44.462256 kg

 

Step 2: Calculate the total dose of Vancomycin in mg/hr:

Total dose (mg/hr) = Ordered dose (mg/kg/hr) x Patient weight (kg)

Total dose (mg/hr) = 5 mg/kg/hr x 44.462256 kg

Total dose (mg/hr) = 222.31128 mg/hr

 

Step 3: Calculate the infusion rate in mL/hr:

Infusion rate (mL/hr) = Total dose (mg/hr) / Concentration (mg/mL)

Infusion rate (mL/hr) = 222.31128 mg/hr / (500 mg/100 mL)

Infusion rate (mL/hr) = 222.31128 mg/hr x (100 mL/500 mg)

Infusion rate (mL/hr) = 44.462256 mL/hr

 

Step 4: Round to the nearest tenth:

Infusion rate (mL/hr) ≈ 44.5 mL/hr


Get 100+ Naxlex Exit Exams for $79 Try Naxlex NCLEX-RN (14 Day Free-Trial)

Naxlex Comprehensive Predictor Exams

Free Nursing Study Resources

Related Questions

Correct Answer is D

Explanation

Given:
Ordered dose of Acyclovir: 12 mg/kg
Patient weight: 115 lbs
Concentration of Acyclovir: 100 mg/2 mL

Step 1: Convert patient weight from pounds to kilograms:
1 pound (lb) = 0.453592 kilograms (kg)
Patient weight in kg = 115 lbs * 0.453592 kg/lb = 52.16308 kg

Step 2: Calculate the total dose of Acyclovir:
Total dose (mg) = Ordered dose (mg/kg) x Patient weight (kg)
Total dose (mg) = 12 mg/kg x 52.16308 kg = 625.95696 mg

Step 3: Calculate the volume to be administered:
Volume (mL) = Total dose (mg) / Concentration (mg/mL)
Volume (mL) = 625.95696 mg / 100 mg/2 mL
Volume (mL) = 625.95696 mg x (2 mL / 100 mg)
Volume (mL) = 12.5191392 mL

Step 4: Round to the nearest tenth:
Volume (mL) ≈ 12.5 mL/dose

Correct Answer is D

Explanation

Given:

Ordered dose of antibiotic: 250 mg

Vial contains: 250 mg of antibiotic

Reconstitution volume: 1.7 mL of sterile water

Final volume after reconstitution: 2 mL

Step 1: Determine the concentration of the reconstituted solution:

Concentration (mg/mL) = Total amount of drug (mg) / Total volume (mL)

Concentration (mg/mL) = 250 mg / 2 mL

Concentration (mg/mL) = 125 mg/mL

Step 2: Calculate the volume to be administered:

Volume (mL) = Ordered dose (mg) / Concentration (mg/mL)

Volume (mL) = 250 mg / 125 mg/mL

Volume (mL) = 2 mL

Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.

Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today

Register