Directions: Complete the following calculations

Published on: August 19, 2024


Include the correct unit of measurement in all answers, 1. Order:

Erythromicin 0.5 g via g-tube gid. Available: Erythromicin oral solution 125 mg per 5 mL How many ml will you give? 2.

Your patient is to receive intermittent tube feedings. The NP orders 300 ml of 1/3 strength Ensure by N.

1. Erythromycin Dosage Calculation

Order: Erythromycin 0.5 g via g-tube, three times a day (tid).

Available: Erythromycin oral solution 125 mg per 5 mL.

Steps:

1.      Convert 0.5 g to mg:

0.5 g=500 mg0.5 \text{ g} = 500 \text{ mg}0.5 g=500 mg

2.      Determine how many mL are needed for 500 mg:

Available concentration=125 mg/5 mL\text{Available concentration} = 125 \text{ mg/5 mL}Available concentration=125 mg/5 mL Volume=Desired DoseAvailable Concentration×Volume of Solution\text{Volume} = \frac{\text{Desired Dose}}{\text{Available Concentration}} \times \text{Volume of Solution}Volume=Available ConcentrationDesired Dose×Volume of Solution Volume=500 mg125 mg×5 mL\text{Volume} = \frac{500 \text{ mg}}{125 \text{ mg}} \times 5 \text{ mL}Volume=125 mg500 mg×5 mL Volume=4×5 mL\text{Volume} = 4 \times 5 \text{ mL}Volume=4×5 mL Volume=20 mL\text{Volume} = 20 \text{ mL}Volume=20 mL

Answer: You will give 20 mL.

2. Tube Feeding Calculation

Order: 300 mL of 1/3 strength Ensure.

Available: (Assumed) Standard Ensure formula, with 1 strength Ensure being the full concentration.

Steps:

1.      If 1 strength Ensure requires a certain volume to make 1/3 strength, you need to dilute the formula.

2.      For 1/3 strength, you would mix 1 part of the Ensure formula with 2 parts of water.

Total Volume=Volume of Ensure+Volume of Water\text{Total Volume} = \text{Volume of Ensure} + \text{Volume of Water}Total Volume=Volume of Ensure+Volume of Water

To get 300 mL of 1/3 strength Ensure:

Volume of Ensure=300 mL3=100 mL\text{Volume of Ensure} = \frac{300 \text{ mL}}{3} = 100 \text{ mL}Volume of Ensure=3300 mL=100 mL Volume of Water=300 mL−100 mL=200 mL\text{Volume of Water} = 300 \text{ mL} - 100 \text{ mL} = 200 \text{ mL}Volume of Water=300 mL100 mL=200 mL

Answer: You will use 100 mL of Ensure and 200 mL of water to make 300 mL of 1/3 strength Ensure.


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