A practical nurse is preparing to administer a scheduled dose of cefazolin 750\text{ mg} i… — NCLEX-PN

A practical nurse is preparing to administer a scheduled dose of cefazolin $750\text{ mg}$ intramuscularly (IM) to a client with a skin infection. The medication is supplied as a $1\text{ gram}$ vial of dry powder. The reconstitution instructions on the vial state: "Add $2.5\text{ mL}$ of sterile water for injection to yield a final concentration of $330\text{ mg/mL}$ ."

How many $\text{mL}$ should the nurse administer? Record the answer to the nearest tenth. Do not include units in the answer.

Cevap: 2.3 mL

Cevap

2.3

The correct volume is found by dividing the desired dose (

750\text{ mg}

) by the available concentration (

330\text{ mg}

per

1\text{ mL}

), which equals

2.2727... \text{ mL}

. Rounded to the nearest tenth, this is

2.3\text{ mL}

. Note that the

1\text{ gram}

total powder amount and the

2.5\text{ mL}

diluent volume are distractors and should not be used in the final equation once the final concentration is known.

Adım Adım Çözüm

Identify the target dose and available concentration from the provided instructions.

Target dose:

750\text{ mg}

, Concentration:

330\text{ mg/mL}

These are the essential values needed to calculate the physical volume to be administered.

Apply the standard dosage calculation formula:

\frac{\text{Desired}}{\text{Have}} \times \text{Volume}

\frac{750\text{ mg}}{330\text{ mg}} \times 1\text{ mL} = 2.2727... \text{ mL}

This formula converts the prescribed medication mass into the correct physical volume based on the reconstituted concentration.

Round the calculated volume to the nearest tenth as instructed.

2.2727... \text{ mL}

rounds to

2.3\text{ mL}

Standard rounding rules dictate that a hundredths digit of

5

or greater rounds the tenths digit up.

Anahtar Kavram

Dosage Calculation for Reconstituted Medications

Soru

Cevap

Adım Adım Çözüm

Anahtar Kavram

Sık Yapılan Hatalar

Konular

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