Question

A client with dehydration is prescribed a potassium chloride infusion at 10 mEq/hr. Potassium chloride 80 mEq is mixed with 1 liter of normal saline. The nurse should regulate the infusion pump to deliver how many mL/hour? (Enter numeric value only. If rounding is required, round to the nearest whole number.)

Answer 1

Correct Answers:

125

Rationale :

💧The order is for 10 mEq/hr and the solution contains 80 mEq in 1000 mL.

🧪Using ratio: 80 mEq ÷ 1000 mL = 0.08 mEq/mL → 10 ÷ 0.08 = 125 mL/hr.

📏This ensures the infusion rate delivers the correct amount of potassium per hour.

⚠️Always monitor infusion concentration closely when giving electrolytes to prevent complications.

📌Core Message

Use the concentration-to-dose ratio to determine the correct mL/hr rate for electrolyte infusions.

Answer 2

Correct Answers:

0.9

Rationale :

💉Available concentration is 100 mg/mL.

🧪90 mg ÷ 100 mg/mL = 0.9 mL.

📏Low-volume anticoagulant injections must be measured precisely to prevent bleeding risks.

💊Dosing errors with enoxaparin can lead to life-threatening complications.

📌Core Message

Divide the ordered dose by the available strength to determine the exact volume in mL.

Answer 3

Correct Answers:

0.8

Rationale :

📦Streptomycin available as 1 g in 2.5 mL → 1000 mg ÷ 2.5 mL = 400 mg/mL.

🧪300 mg ÷ 400 mg/mL = 0.75, rounded to 0.8 mL.

💉Streptomycin dosing must be precise to avoid ototoxicity and nephrotoxicity.

📏Administering exact volumes helps ensure therapeutic efficacy without overdosing.

📌Core Message

Find mg per mL using vial label, then divide the prescribed dose to get volume to inject.

Answer 4

Correct Answers:

375

Rationale :

🕒5 hours × 125 mL/hr = 625 mL already infused.

💧1000 mL – 625 mL = 375 mL remaining.

📏Tracking remaining volume helps ensure accurate fluid balance and prevent under- or over-infusion.

🧪Always subtract the infused amount from the original total to determine what's left.

📌Core Message

Calculate infused volume, subtract from total bag volume to find fluid remaining.

Answer 5

Correct Answers:

97.7

Rationale :

📏Use the formula: (°C × 9 ÷ 5) + 32 → (36.5 × 9 ÷ 5) + 32 = 65.7 + 32 = 97.7°F.

🧪This is a standard temperature conversion required in documentation.

📋Fahrenheit is often used in U.S. clinical charts for consistency.

💉Correct conversion ensures accurate client records.

📌Core Message

Apply the temperature conversion formula to record accurate Fahrenheit values from Celsius.

Answer 6

Correct Answers:

6

Rationale :

📦200 mg labetalol in 200 mL = 1 mg/mL.

🧪2 mg/min = 2 mL/min

💁‍♂️2 × 60 = 120 mL/hr

👍2 mg/min ÷ 1 mg/mL = 2 mL/min × 60 = 120 mL/hr.

📌Core Message

Divide mg/min by concentration, then convert to mL/hr for correct infusion rate.

Answer 7

Correct Answers:

1

Rationale :

⚖️59 kg × 5 mcg = 295 mcg.

📦Available: 300 mcg/mL → 295 ÷ 300 = 0.983, rounded to 1 mL.

📏SUBQ medications like filgrastim must be administered in precisely calculated volumes.

🧪Rounding ensures the dose is within safe therapeutic range.

📌Core Message

Multiply weight by mcg/kg, then divide by mcg/mL concentration to determine volume to give.

Answer 8

Correct Answers:

83

Rationale :

📦1000 mL ÷ 12 hours = 83.3, rounded to 83 mL/hr.

🧪This is a standard fluid replacement calculation to prevent dehydration.

📏Round infusion rates to whole numbers for pump programming.

💧Ensures the client receives steady IV fluid therapy.

📌Core Message

Divide fluid volume by hours to calculate the infusion pump rate.

Answer 9

Correct Answers:

0.7

Rationale :

📦35 mg ÷ 50 mg/mL = 0.7 mL.

📏This delivers the correct dose for IM antiemetic therapy.

🧪Always round to the nearest tenth when using viscous IM medications.

💉Volume accuracy avoids both underdosing and injection complications.

📌Core Message

Use dose ÷ concentration to get the correct IM injection volume.

Answer 10

Correct Answers:

56

Rationale :

📦2000 mL over 12 hr = 167 mL/hr.

🧮(167 × 20) ÷ 60 = 3340 ÷ 60 = 55.6, rounded to 56 gtt/min.

📏Use total volume and drop factor to set manual IV flow rate.

💧Rounding ensures consistent gravity infusion using standard IV tubing.

📌Core Message

Calculate gtt/min by multiplying rate by drop factor, then dividing by minutes per hour.

HESI RN Dosage Calculations 2025 Exam-2

No.

2 :
The nurse is preparing to administer enoxaparin 90 mg subcutaneously daily to a client admitted with a pulmonary embolism. The pharmacy provides a prefilled syringe labeled "Enoxaparin 100 mg/1 mL." How many milliliters should the nurse administer? (Enter numeric value only.)

5 :
The nurse is caring for a client with an oral temperature of 36.5°C. What temperature in Fahrenheit should the nurse document in the medical record? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

7 :
The healthcare provider prescribes a single dose of filgrastim 5 mcg/kg subcutaneously for a client who weighs 59 kg. The medication is available in a 300 mcg/mL vial. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

8 :
The healthcare provider prescribes 1 liter of 0.9% Sodium chloride, USP intravenously to be infused over 12 hours for a client. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only. If rounding is required, round to the nearest whole number.)

9 :
The healthcare provider prescribes hydroxyzine 35 mg IM for a client who is vomiting. The available drug is labeled 50 mg/mL. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

HESI RN Dosage Calculations 2025 Exam-2

No.

2 : The nurse is preparing to administer enoxaparin 90 mg subcutaneously daily to a client admitted with a pulmonary embolism. The pharmacy provides a prefilled syringe labeled "Enoxaparin 100 mg/1 mL." How many milliliters should the nurse administer? (Enter numeric value only.)

5 : The nurse is caring for a client with an oral temperature of 36.5°C. What temperature in Fahrenheit should the nurse document in the medical record? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

7 : The healthcare provider prescribes a single dose of filgrastim 5 mcg/kg subcutaneously for a client who weighs 59 kg. The medication is available in a 300 mcg/mL vial. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

8 : The healthcare provider prescribes 1 liter of 0.9% Sodium chloride, USP intravenously to be infused over 12 hours for a client. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only. If rounding is required, round to the nearest whole number.)

9 : The healthcare provider prescribes hydroxyzine 35 mg IM for a client who is vomiting. The available drug is labeled 50 mg/mL. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

2 :
The nurse is preparing to administer enoxaparin 90 mg subcutaneously daily to a client admitted with a pulmonary embolism. The pharmacy provides a prefilled syringe labeled "Enoxaparin 100 mg/1 mL." How many milliliters should the nurse administer? (Enter numeric value only.)

5 :
The nurse is caring for a client with an oral temperature of 36.5°C. What temperature in Fahrenheit should the nurse document in the medical record? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

7 :
The healthcare provider prescribes a single dose of filgrastim 5 mcg/kg subcutaneously for a client who weighs 59 kg. The medication is available in a 300 mcg/mL vial. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)

8 :
The healthcare provider prescribes 1 liter of 0.9% Sodium chloride, USP intravenously to be infused over 12 hours for a client. How many mL/hr should the nurse program the infusion pump to deliver? (Enter numerical value only. If rounding is required, round to the nearest whole number.)

9 :
The healthcare provider prescribes hydroxyzine 35 mg IM for a client who is vomiting. The available drug is labeled 50 mg/mL. How many mL should the nurse administer? (Enter numerical value only. If rounding is required, round to the nearest tenth.)