FREE NEX Mathematical Calculations: Dosages and Solutions Questions and Answers

Question 1

A physician orders 500 mg of a medication. The medication is available in 250 mg tablets. How many tablets should the nurse administer?

Accepted Answer

2 tablets

Answer

To solve this, use the formula: Dose Ordered / Dose on Hand. In this case, 500 mg (ordered) divided by 250 mg (on hand) equals 2. The nurse should administer 2 tablets.

Question 2

The order is for 60 mg of a liquid medication. The pharmacy supplies the medication in a concentration of 80 mg/2 mL. How many mL should be administered?

Accepted Answer

1.5 mL

Answer

Use the formula: (Dose Ordered / Dose on Hand) x Quantity. This is (60 mg / 80 mg) x 2 mL. This simplifies to 0.75 x 2 mL, which equals 1.5 mL.

Question 3

An IV bag contains 1000 mL of fluid to be infused over 5 hours. At what rate in mL/hr should the nurse set the infusion pump?

Accepted Answer

200 mL/hr

Answer

To find the infusion rate in mL per hour, divide the total volume by the total time in hours. 1000 mL divided by 5 hours equals 200 mL/hr.

Question 4

A patient who weighs 70 kg is prescribed a medication at a dose of 3 mg/kg. What is the total dose in mg the patient should receive?

Accepted Answer

210 mg

Answer

To calculate a weight-based dose, multiply the patient's weight in kg by the prescribed dose per kg. 70 kg multiplied by 3 mg/kg equals 210 mg.

Question 5

A doctor prescribes 0.75 g of a drug. The available tablets are 250 mg each. How many tablets should be given?

Accepted Answer

3 tablets

Answer

First, convert the prescribed dose to the same unit as the available tablets. Since 1 g = 1000 mg, 0.75 g is equal to 750 mg. Then, divide the ordered dose (750 mg) by the dose on hand (250 mg), which equals 3 tablets.

(NEX) Nursing Entrance Exam Practice Test

(NEX) Nursing Entrance Exam Practice Test

FREE NEX Mathematical Calculations: Dosages and Solutions Questions and Answers