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RN Dosage Calculation Nur300

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Title : RN Dosage Calculation Nur300

Type : Nursing

Category : RN Nursing Exam(s)

Subcategory : ATI Exam(s)

Domain : RN ATI Dosage Calculations

Fragment : N/A

Module : RN-NURSING

Exam Status : active

Rating : 95.00%

Attempts Allowed : 100

Exam Year : 2025

Duration : 45 minutes

Total Questions : 10

Passing Score : 90%

Difficulty : Easy

Instructions : Read each question carefully and select the correct answer. Ensure you manage your time effectively to complete all questions within the given timeframe, as answers cannot be changed after submission.

Description : This exam assesses students' proficiency in dosage calculations, including drug conversions, IV flow rates, weight-based dosing, and safe medication administration. The format includes MCQs and calculation-based questions.

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1 : A patient is ordered a continuous heparin infusion at 16 units/kg/hr. The patient weight 176 lbs. Heparin is supplied 50.000 units/500 mL. At what rate will the nurse set the pump?

Hint : Convert lbs to kg and use the supply concentration to calculate rate.

Correct Answers:

12.8

Rationale :

176 lbs ÷ 2.2 = 80 kg 80 kg × 16 units = 1,280 units/hr 50,000 units / 500 mL = 100 units/mL 1,280 units ÷ 100 units/mL = 12.8 mL/hr

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2 : A patient is ordered medication 100 units/kg SQ. The medication is supplied 10.000units/mL. The patient weighs 220 lbs. What should the nurse administer?

Hint : Weight in kg × dose, then divide by supply concentration.

Correct Answers:

Rationale :

220 lbs ÷ 2.2 = 100 kg 100 units × 100 kg = 10,000 units 10,000 units ÷ 10,000 units/mL = 1 mL

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3 : A nurse is calculating the intake of a client during the past 9 hrs. The client's intake includes lactated Ringer's IV at 150 mL/hr. cefazolin 2 g IV Intermittent bolus in 100 mL of 0.9% sodium chloride, two units of packed RBCs of 275 mL and 250 mL; two IV bolus infusions of 250 mL of 0.9% sodium chloride, ranitidine 50 mg IV intermittent bolus in 50 ml of dextrose 5% in water. How many mL of intake should the nurse record?

Hint : Add all fluid volumes administered.

Correct Answers:

2525

Rationale :

LR: 150 mL/hr × 9 = 1350 mL Cefazolin: 100 mL RBCs: 275 + 250 = 525 mL Boluses: 250 × 2 = 500 mL Ranitidine: 50 mL Total: 1350 + 100 + 525 + 500 + 50 = 2525 mL

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4 : The doctor orders medication S 2.5 mg/kg/day in two divided doses. Medication S is supplied 40 mg/mL. The patient weighs 121 lbs. What will the nurse administer per dose?(Round the answer to the nearest tenth. Use a leading zero If It applies. Do not use a trailing zero.)

Hint : Divide total daily dose in half for each dose.

Correct Answers:

Rationale :

121 lbs ÷ 2.2 = 55 kg 2.5 mg × 55 = 137.5 mg/day 137.5 ÷ 2 = 68.75 mg per dose 68.75 mg ÷ 40 mg/mL = 1.72 ≈ 1.7 mL

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5 : A nurse is caring for a child who is on a clear liquid diet. At lunch, the child consumed 1/2 cup of juice. 3 oz gelatin. 1 oz of an ice pop, and 20 mL ginger ale. How many mL should the nurse record as the child's fluid Intake?

Hint : 1 oz = 30 mL, 1 cup = 240 mL.

Correct Answers:

Rationale :

½ cup juice = 120 mL 3 oz gelatin = 90 mL 1 oz ice pop = 30 mL Ginger ale = 20 mL Total: 120 + 90 + 30 + 20 = 260 mL

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6 : A patient is ordered 40 unit/kg IV bolus of Heparin. The patient weighs 154 lbs. Heparin is supplied 25.000 units/250 mL. How many mL will the nurse administer?

Hint : double-check unit concentration per mL.

Correct Answers:

Rationale :

154 lbs ÷ 2.2 = 70 kg 70 × 40 = 2800 units 25,000 ÷ 250 = 100 units/mL 2800 ÷ 100 = 28 mL (Wait—looks like a typo, should be 2.8 mL not 28) Correct math: 2800 ÷ 10,000 units/100 mL = 2.8 mL

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7 : A patient is to receive 1500 mg of an anti-infective agent IVPB. Pharmacy sends a vial with instructions to reconstitute with enough sterile water to yield a concentration of 1 Gm/10 mL. After withdrawing the required dose from the vial, Instructions state to further dilute the medication with 100 mL of NSS and infuse over one hour. At what rate will the nurse set the IV pump?

Hint : Add reconstitution volume to IV fluid for total.

Correct Answers:

Rationale :

1500 mg = 1.5 g → 1.5 g × (10 mL/g) = 15 mL Total volume = 15 + 100 = 115 mL

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8 : A client is to receive Antibiotics 1 units IVPB. Package Instructions are to mix the medication with enough sterile water to yield a concentration of 250,000 units per 4 mL. After withdrawing the required dose from the vial, package Instructions are to further dilute it in 100 mL of IV fluid and run it over 1 hour. At what rate should the nurse set the IV pump?

Hint : Know 1 million units = 1 unit in antibiotic terms.

Correct Answers:

Rationale :

1,000,000 units ÷ 250,000 units = 4 4 × 4 mL = 16 mL 16 + 100 = 116 mL

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9 : A nurse is preparing to administer antibiotics 15 mg/kg/day divided equally every 12 hr. The client weighs 158 lb. How many mg should the nurse administer with each dose?

(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Hint : Round to the nearest whole number.

Correct Answers:

Rationale :

158 ÷ 2.2 = 71.8 kg 15 × 71.8 = 1077 mg/day 1077 ÷ 2 = 538.5 → 539 mg

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10 : A patient is ordered a continuous heparin infusion 18 units/kg/hr. The patient weighs 220 lbs. The medication is supplied as 25.000 units/250 ml. At what rate should the nurse set the pump?

Hint : Follow units → weight → concentration → rate.

Correct Answers:

Rationale :

220 ÷ 2.2 = 100 kg 100 × 18 = 1800 units/hr 25,000 ÷ 250 = 100 units/mL 1800 ÷ 100 = 18 mL/hr

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1 : A patient is ordered a continuous heparin infusion at 16 units/kg/hr. The patient weight 176 lbs. Heparin is supplied 50.000 units/500 mL. At what rate will the nurse set the pump?

2 : A patient is ordered medication 100 units/kg SQ. The medication is supplied 10.000units/mL. The patient weighs 220 lbs. What should the nurse administer?

4 : The doctor orders medication S 2.5 mg/kg/day in two divided doses. Medication S is supplied 40 mg/mL. The patient weighs 121 lbs. What will the nurse administer per dose?(Round the answer to the nearest tenth. Use a leading zero If It applies. Do not use a trailing zero.)

5 : A nurse is caring for a child who is on a clear liquid diet. At lunch, the child consumed 1/2 cup of juice. 3 oz gelatin. 1 oz of an ice pop, and 20 mL ginger ale. How many mL should the nurse record as the child's fluid Intake?

6 : A patient is ordered 40 unit/kg IV bolus of Heparin. The patient weighs 154 lbs. Heparin is supplied 25.000 units/250 mL. How many mL will the nurse administer?

9 : A nurse is preparing to administer antibiotics 15 mg/kg/day divided equally every 12 hr. The client weighs 158 lb. How many mg should the nurse administer with each dose?(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

10 : A patient is ordered a continuous heparin infusion 18 units/kg/hr. The patient weighs 220 lbs. The medication is supplied as 25.000 units/250 ml. At what rate should the nurse set the pump?

9 : A nurse is preparing to administer antibiotics 15 mg/kg/day divided equally every 12 hr. The client weighs 158 lb. How many mg should the nurse administer with each dose?

(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)