Dosage Calculation RN Fundamentals Online Practice Assessment 3.0.pdf file:///C:/Users/HP/Desktop/New%20folder%20(4)/Dosage%20Calcu
Dosage Calculation RN Fundamentals Online
Practice Assessment 3.0 Questions & Answers
1. A nurse is preparing to administer codeine 20 mg PO every 6 hr PRN pain.
Available is codeine oral solution 10 mg/ 5 mL. How many mL should the nurse
administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a
trailing zero.)
: Answer: 10 mL
Follow these steps for the Ratio and Proportion method of calculation: Step
1: What is the unit of measurement the nurse should calculate? mL
Step 2:What is the dose the nurse should administer? Dose to administer = Desired 20
mg
Step 3: What is the dose available? Dose available = Have 10 mg Step 4:
Should the nurse convert the units of measurement? No Step 5: What
is the quantity of the dose available? 5 mL
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Step 6: Set up an equation and solve for X. Have/Quantity =
Desired/X
10 mg/ 5 mL = 20 mg/ X mL X
mL = 10 mL
Step 7: Round if necessary.
Step 8: Determine whether the amount to administer makes sense. If there are 10
mg/5 mL and the prescription reads 20 mg, it makes sense to administer 10 mL.The
nurse should administer codeine oral solution 10 mL PO every 6 hr PRN pain.
2. A nurse is preparing to administer eszopiclone 2,000 mcg PO to a client.
How many mg should the nurse administer?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a
trailing zero.)
: Answer: 2 mg
Follow these steps for the Ratio and Proportion method of calculation: Step
1: What is the unit of measurement the nurse should calculate? mg
Step 2:What is the dose the nurse should administer? Dose to administer = Desired
2,000 mcg
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Step 3: What is the dose available? Dose available = Have 1 mg
Step 4: Should the nurse convert the units of measurement? Yes (mcg does not equal
mg)
1,000 mcg/1 mg = 2,000 mcg/X mg X
mg = 2 mg
Step 5: Round if necessary.
Step 6: Determine whether the amount to administer makes sense.If the prescription
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reads 2,000 mcg and 1,000 mcg equals 1 mg, it makes sense to administer 2 mg. The
nurse should administer eszopiclone 2 mg PO.
3. A nurse is preparing to administer tobramycin 4 mg/kg/day IM divided in
three equal doses to a patient who weighs 60 kg. Available is tobramycin 40
mg/mL. How many mL should the nurse administer per dose?
(Round to the nearest whole number. Use a leading zero if it applies. Do not use a
trailing zero.)
: Answer: 2 mL
Follow these steps for the Ratio and Proportion method of calculation: Step
1: What is the unit of measurement the nurse should calculate? mg Step 2: Set
up an equation and solve for X.
X = Dose per kg × Client's weight in kg X
mg = 4 mg/kg × 60 kg
X mg = 240 mg
The dose is divided into three equal doses; therefore, divide X by 3. 240
mg = 80 mg3
Step 3: What is the unit of measurement the nurse should calculate? mL
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