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A group of nursing students are reviewing the various systems of measurement. The students demonstrate understanding of the information when they identify which of the following as a metric system unit? Select all that apply.
- A. Inch
- B. Milligram
- C. Centimeter
- D. Ounce
- E. Pound
Correct Answer: B,C
Rationale: The metric system uses the gram, liter, and meter. Milligram and centimeter are metric units.
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A home health care nurse is reviewing a client's medication during a home visit. The client is prescribed atorvastatin 10 mg daily, a change from his previous order of 20 mg daily. The client shows the nurse the medication container from the pharmacy. The label reads atorvastatin 20 mg. The nurse determines that the client is taking the correct dosage when the client states he is taking which of the following
- A. 1/2 tablet every day
- B. 1 tablet every day
- C. 1/2 tablet every other day
- D. 1 tablet every other day
Correct Answer: A
Rationale: The on-hand dose of the drug is 20 mg, but the client is to take 10 mg daily. So the client is correct when he says that he takes 1/2 tablet daily. Any other dosage would be incorrect.
The health care provider orders chlorpromazine 25 mg IM. The drug is supplied as chlorpromazine 50 mg/mL in a 1-mL ampule. How much would the nurse administer?
- A. 0.25 mL
- B. 0.5 mL
- C. 0.75 mL
- D. 1.0 mL
Correct Answer: B
Rationale: The drug is supplied as 50 mg in 1 mL. Calculating the dosage using the formula D / H ? Q, the equation would read: 25 mg / 50 mg ? 1 mL = 0.5 mL.
A client is to receive 250 mg of penicillin VK twice daily for 10 days. Penicillin VK is available in a 500 mg tablet. The nurse would instruct the client to take???.tablet at each dose.
- A. 1/4 tablet
- B. 1/2 tablet
- C. 1 tablet
- D. 2 tablets
Correct Answer: B
Rationale: 250 mg / 500 mg = 0.5 tablets.
"Dose desired / dose on hand = dose administered" is the formula for calculating the dose to be administered. Under under which of the following circumstances is this to be used?
- A. When the physician is not available to calculate the dosage
- B. When the dosage is written in the apothecary system
- C. When the dose desired and dose on hand are in the same system
- D. When the label of the drug is in the metric system
Correct Answer: C
Rationale: When the dose ordered by the physician (dose desire is written in the same system as the dose on the drug container (dose on han, the above formula is used for calculating the dose to be administered. When the physician is not available to calculate the dosage, the dosage is written in the apothecary system, and the label of the drug is in the metric system are circumstances in which it becomes necessary for the nurse to compute the drug dosage.
A nursing instructor is describing how to perform dosage calculations using dimensional analysis. Which of the following would the instructor emphasize to ensure accuracy?
- A. A formula that is specific to the drug being administered is needed.
- B. Decimals rather than fractions are used to determine amounts.
- C. Proportions are needed but labels related to units are not important.
- D. The focus is on the unit of measure set up in a specific order.
Correct Answer: D
Rationale: Dimensional analysis is a method used to perform calculations where the focus is on the units of measure, thereby eliminating the need to memorize equations. Because the units are set up in a specific order, it eliminates the need to be concerned about setting up proportions correctly. When using DA to calculate dosage problems, dosages are written as common fractions.