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A nurse is preparing to administer cefazolin 250 n IM to a client. Available is cefazolin powder for injection 500 mg vial. The nurse reconstitutes the powder with 2 mL of sterile water for a concentration of 225 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

Answer and Explanation

The Correct Answer is ["1.1"]

Determine the desired dosage:

The nurse needs to administer 250 mg of cefazolin.

Determine the volume per dose:

The concentration of the reconstituted cefazolin solution is 225 mg/mL.

The nurse needs to administer 250 mg per dose.

To find the volume per dose:

225 mg / 1 mL = 250 mg / x mL

Cross-multiplying gives us:

225x = 250

Dividing both sides by 225, we get:

x = 1.111 mL

Round the answer to the nearest tenth:

Rounding 1.111 to the nearest tenth gives us 1.1 mL.

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Correct Answer is D

Explanation

A. Take 0.5 oz 30 minutes before meals and at bedtime:
The unit "oz" (ounce) is not a metric unit. Ounces are part of the imperial measurement system, not the metric system. The metric equivalent of ounces for liquid measurements would be milliliters (mL). Therefore, this prescription is using an imperial unit.

B. Take 1 tsp four times daily:
The unit "tsp" stands for teaspoon, which, although used in common medical practice, is not a metric unit. A teaspoon is a unit of volume in the U.S. customary system, equivalent to approximately 5 mL in the metric system. However, teaspoons themselves are not part of the metric system, so this instruction is not using a metric unit.

C. Take 2 drops four times daily:
The unit "drops" is a non-metric unit of measurement and is used to describe small volumes of liquid, often in medication dosages. While the exact volume of a drop can vary depending on the liquid and dropper, it is not a metric measurement.

D. Take 15 mL, 1 hr after meals and at bedtime:
The unit "mL" stands for milliliters, which is a metric unit of volume. The prescription specifically uses the metric system for dosage measurement, making it the correct option. Milliliters are the standard unit for measuring liquid medications in the metric system.

Correct Answer is ["0.9"]

Explanation

Convert the client's weight from pounds to kilograms:

There are 2.205 pounds in 1 kilogram.

99 lb = 99 lb / 2.205 lb/kg = 44.91 kg (rounded to two decimal places).

Determine the total dosage:

The client is prescribed 0.2 mg/kg of morphine.

The client weighs 44.91 kg.

The total dosage is 0.2 mg/kg x 44.91 kg = 8.982 mg.

Determine the volume per dose:

The morphine injection contains 10 mg per 1 mL.

The nurse needs to administer 8.982 mg per dose.

To find the volume per dose:

10 mg / 1 mL = 8.982 mg / x mL

Cross-multiplying gives us:

10x = 8.982

Dividing both sides by 10, we get:

x = 0.8982 mL

Round the answer to the nearest tenth:

Rounding 0.8982 to the nearest tenth gives us 0.9 mL.

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Naxlex Comprehensive Predictor Exams

A nurse is reviewing the medication list of a client. Which of the following medication instructions should the nurse identify as being prescribed using a metric unit?

Correct Answer is D

Explanation

A nurse is preparing to administer morphine 0.2 mg/kg IM to a client who weighs 99 lb. The Available is morphine injection 10 mg/ml. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use leading zero if it applies. Do not use a trailing zero.)

Correct Answer is ["0.9"]

Explanation

A nurse is preparing to administer diphenhydramine 25 mg/kg IM to a child who weighs 66lb. Available is diphenhydramine injection 50 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A nurse is preparing to administer lidocaine 200 mg IM stat and repeat in 60 min. Available is lidocaine injection 300 mg/3 mL. How many mL should the nurse administer per dose? (Round the answer to the nearest whole number. Use a leading, zero if it applies. Do not use a trailing zero.)

A nurse is preparing to administer metronidazole 7.5 mg/kg PO to a client who weighs 146.7 lb. Available is metronidazole 500 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use trailing zero.)

A nurse is preparing to administer isoniazid 187 mg IM. Available is isoniazid injection 100 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A nurse is preparing to administer sumatriptan 6 mg subcutaneous to a client. Available is sumatriptan injection 6 mg/0.5 mL. How many mL should the nurse administer? (Round off the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

A nurse is preparing to administer bumetanide 5 mg, PO daily. Available is bumetanide 0.5 mg tablets. How many tablets should the nurse administer? (Round the answer to the nearest whole number. Use leading zero if it applies. Do not use a trailing zero.)

A nurse is teaching a newly hired nurse about documentation in the medical record. Which of the following abbreviations should the newly hired nurse identify as a metric unit of weight?

A nurse weighed a client who is following a weight-loss plan. The scale shows that the client weighs 91 kg. What is the client's weight in lb? (Round of the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)