Question

The healthcare provider prescribes cefazolin 800 mg IM every 6 hours. The available vial is labeled, "Cefazolin 1 gram," and the instructions for reconstitution state, "For IM use, add 2.5 mL sterile water for injection to provide a total volume of 3.0 mL.. "How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

Answer 1

Correct Answers:

2.4

Rationale :

🧪The available vial contains 1 gram (1,000 mg) in 3.0 mL after reconstitution.

📏To find the amount for 800 mg: 800 mg ÷ 1,000 mg = 0.8.

🧮Multiply: 0.8 × 3.0 mL = 2.4 mL.

💉The nurse should administer 2.4 mL to deliver the prescribed dose of 800 mg.

📌Core Message

Use proportion-based dosing with the total reconstituted volume and desired dose to determine how much to administer.

Answer 2

Correct Answers:

0.9

Rationale :

💁‍♂️Hydromorphone: 4 mg ÷ 10 mg/mL = 0.4 mL.

🧪Hydroxyzine: 25 mg ÷ 50 mg/mL = 0.5 mL.

👉Total volume = 0.4 mL + 0.5 mL = 0.9 mL.

💉Therefore, the nurse administers 0.9 mL total for both drugs.

📌Core Message

Calculate each medication’s volume separately using individual concentrations before totaling for administration.

Answer 3

Correct Answers:

440

Rationale :

📦The secondary bag contains 110 mL to be infused in 15 minutes.

⚖Convert 15 minutes to hours: 15 ÷ 60 = 0.25 hours.

💁‍♂️Rate = 110 mL ÷ 0.25 hr = 440 mL/hr.

💉Set the pump to 440 mL/hr for accurate delivery in 15 minutes.

📌Core Message

Use volume ÷ time in hours to calculate secondary infusion rates in mL/hr.

Answer 4

Correct Answers:

8

Rationale :

🧪Each dose is 800 mg, and tablets are 400 mg each.

👉800 mg ÷ 400 mg/tablet = 2 tablets per dose.

📅Given every 6 hours → 4 doses in 24 hours.

🧮4 doses × 2 tablets = 8 tablets/day.

📌Core Message

Multiply the number of tablets per dose by the daily dosing frequency to find total daily intake.

Answer 5

Correct Answers:

60

Rationale :

⚖️Weight = 66 lb ÷ 2.2 = 30 kg.

🧮Dose = 2 mg × 30 kg = 60 mg.

📅This is the amount per dose, given every 8 hours.

💉Therefore, administer 60 mg/dose.

📌Core Message

Use weight-based dosing (mg/kg) after converting pounds to kilograms to determine correct dose.

Answer 6

Correct Answers:

20

Rationale :

🧪Total solution: 50 units insulin in 100 mL.

🧮Concentration = 50 ÷ 100 = 0.5 units/mL.

📏10 units ÷ 0.5 units/mL = 20 mL/hr.

💉Set the infusion pump at 20 mL/hr.

📌Core Message

Determine concentration per mL, then use desired units ÷ units/mL to calculate flow rate.

Answer 7

Correct Answers:

200

Rationale :

👉Total volume is 200 mL, to be infused over 1 hour.

💁‍♂️Rate = 200 mL ÷ 1 hour = 200 mL/hr.

💉Set the IV pump to 200 mL/hr for proper infusion.

📌Core Message

When the infusion duration is in hours, use volume ÷ time in hours to get mL/hr rate.

Answer 8

Correct Answers:

0.5

Rationale :

⚖️Weight = 132 lb ÷ 2.2 = 60 kg.

💁‍♂️Dose = 5 mcg × 60 kg = 300 mcg.

📦Concentration = 480 mcg ÷ 0.8 mL = 600 mcg/mL.

🧮Volume = 300 ÷ 600 = 0.5 mL.

📌Core Message

Use dose ÷ concentration to find the correct volume for subcutaneous administration.

Answer 9

Correct Answers:

21

Rationale :

🧪1 liter = 1,000 mL to be infused over 8 hours.

🕒Calculate total minutes: 8 hr × 60 = 480 minutes.

🧮Drops/min = (1,000 mL × 10 gtt/mL) ÷ 480 = 20.83, rounded to 21 gtt/min.

💧Set the IV to 21 gtt/min to deliver the prescribed volume accurately.

📌Core Message

To calculate drip rate, use the formula (total volume × drop factor) ÷ minutes.

Answer 10

Correct Answers:

0.25

Rationale :

🧪Total concentration = 5 mg/mL.

🧮Dose = 1.25 mg ÷ 5 mg/mL = 0.25 mL.

💉Administer 0.25 mL to deliver the correct subQ dose.

🧫Use a calibrated syringe for accuracy with low volume doses.

📌Core Message

Use dose ÷ concentration to calculate precise low-volume parenteral doses.

HESI RN Dosage Calculation 2024 Exam-3

No.

4 :
The healthcare provider prescribes acyclovir 800 mg by mouth (PO) every 6 hours for an adolescent with chicken pox. The medication is available in 400 mg tablets PO. How many tablets should the nurse administer to the client every 24 hours? (Enter the numeric value only.)

5 :
A 9-year-old child who weighs 66 lb is to receive gentamicin sulfate 2 mg/kg/dose every 8 hours for an Escherichia coli urinary tract infection. How many mg per dose should this child receive? (Enter numeric value only.)

6 :
The pharmacy delivers an IV infusion of sodium chloride 100 mL with regular insulin 50 units for a client in diabetic ketoacidosis. The prescription rate is 10 units/hour. How many mL/hour should the nurse program the infusion pump? (Enter numeric value only.)

7 :
A client receives a prescription for IV ciprofloxacin 400 mg every 12 hours, which is to be infused over an hour. The IV bag contains ciprofloxacin 400 mg in dextrose 5% in water (DSW) 200 mL. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only)

9 :
A client receives a prescription for 1 liter of lactated Ringer's IV to be infused over 8 hours. The IV administration set delivers 10 gtt/mL. How many gtt/min should the nurse regulate the infusion? (Enter numerical value only. If rounding is required, round to the nearest whole number.)

HESI RN Dosage Calculation 2024 Exam-3

No.

4 : The healthcare provider prescribes acyclovir 800 mg by mouth (PO) every 6 hours for an adolescent with chicken pox. The medication is available in 400 mg tablets PO. How many tablets should the nurse administer to the client every 24 hours? (Enter the numeric value only.)

5 : A 9-year-old child who weighs 66 lb is to receive gentamicin sulfate 2 mg/kg/dose every 8 hours for an Escherichia coli urinary tract infection. How many mg per dose should this child receive? (Enter numeric value only.)

6 : The pharmacy delivers an IV infusion of sodium chloride 100 mL with regular insulin 50 units for a client in diabetic ketoacidosis. The prescription rate is 10 units/hour. How many mL/hour should the nurse program the infusion pump? (Enter numeric value only.)

7 : A client receives a prescription for IV ciprofloxacin 400 mg every 12 hours, which is to be infused over an hour. The IV bag contains ciprofloxacin 400 mg in dextrose 5% in water (DSW) 200 mL. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only)

9 : A client receives a prescription for 1 liter of lactated Ringer's IV to be infused over 8 hours. The IV administration set delivers 10 gtt/mL. How many gtt/min should the nurse regulate the infusion? (Enter numerical value only. If rounding is required, round to the nearest whole number.)

4 :
The healthcare provider prescribes acyclovir 800 mg by mouth (PO) every 6 hours for an adolescent with chicken pox. The medication is available in 400 mg tablets PO. How many tablets should the nurse administer to the client every 24 hours? (Enter the numeric value only.)

5 :
A 9-year-old child who weighs 66 lb is to receive gentamicin sulfate 2 mg/kg/dose every 8 hours for an Escherichia coli urinary tract infection. How many mg per dose should this child receive? (Enter numeric value only.)

6 :
The pharmacy delivers an IV infusion of sodium chloride 100 mL with regular insulin 50 units for a client in diabetic ketoacidosis. The prescription rate is 10 units/hour. How many mL/hour should the nurse program the infusion pump? (Enter numeric value only.)

7 :
A client receives a prescription for IV ciprofloxacin 400 mg every 12 hours, which is to be infused over an hour. The IV bag contains ciprofloxacin 400 mg in dextrose 5% in water (DSW) 200 mL. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only)

9 :
A client receives a prescription for 1 liter of lactated Ringer's IV to be infused over 8 hours. The IV administration set delivers 10 gtt/mL. How many gtt/min should the nurse regulate the infusion? (Enter numerical value only. If rounding is required, round to the nearest whole number.)