The package insert instructs reconstituting with 3.4 mL of sterile water to yield nafcillin 250 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Answer and Explanation

The Correct Answer is ["2"]

Step 1 is to determine the amount of medication in 1 mL after reconstitution. This is calculated by dividing the total available medication (1000 mg) by the total volume after reconstitution (3.4 mL):

1000 mg ÷ 3.4 mL = 294.12 mg/mL

Step 2 is to determine how many mL are needed to obtain 500 mg. This is done by dividing the required dose (500 mg) by the concentration (294.12 mg/mL):

500 mg ÷ 294.12 mg/mL = 1.7 mL

Rounding to the nearest whole number, the correct amount to administer is 2 mL.

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Correct Answer is ["1.9"]

Explanation

Step 1 is to convert the client’s weight from pounds to kilograms since the dosage is prescribed in mcg/kg. Given that 1 kg = 2.2 lb, we calculate:

165 lb ÷ 2.2 = 75 kg

Step 2 is to calculate the volume of naloxone to be administered. The prescribed dosage is 10 mcg/kg, so we first determine the total dose:

10 mcg/kg × 75 kg = 750 mcg

Next, we convert the available concentration of naloxone from mg/mL to mcg/mL:

0.4 mg/mL × 1000 mcg/mg = 400 mcg/mL

Now, we calculate the required volume by dividing the total dose by the concentration:

750 mcg ÷ 400 mcg/mL = 1.875 mL

Rounding to the nearest tenth, the correct amount to administer is 1.9 mL.

Correct Answer is ["2.1"]

Explanation

First, we need to calculate the total daily dose of tobramycin for the client. The total daily dose is calculated as follows:

Total daily dose = Dose per kg per day x Weight Total daily dose = 3 mg/kg/day x 85 kg Total daily dose = 255 mg/day

Since the total daily dose is divided into three doses, each dose will be:

Each dose = Total daily dose / Number of doses Each dose = 255 mg / 3 Each dose = 85 mg

Now, we need to convert this dose into mL. We know that we have tobramycin 40 mg/mL, so:

Volume to administer = Each dose / Concentration Volume to administer = 85 mg / 40 mg/mL Volume to administer = 2.125 mL

Rounding this to the nearest tenth, we get 2.1 mL.

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The package insert instructs reconstituting with 3.4 mL of sterile water to yield nafcillin 250 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is preparing to administer naloxone 10 mcg/kg IM to a client who weighs 165 lb. Available is naloxone 0.4 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.)

Correct Answer is ["1.9"]

Explanation

Correct Answer is ["2.1"]

Explanation

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The package insert instructs reconstituting with 3.4 mL of sterile water to yield nafcillin 250 mg/mL. How many mL should the nurse administer?
(Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)