NursingSprint

Step 1: Identify the ordered dose and the reconstituted concentration

Ordered dose = 250 mg

Available concentration after reconstitution = 225 mg/mL

Step 2: Use the formula to calculate volume to administer

Formula:

Volume (mL) = Dose (mg) ÷ Concentration (mg/mL)

Calculation:

Volume = 250 ÷ 225 = 1.111… mL

Step 3: Round the final answer to the nearest tenth

Rounded Volume:

1.1 mL

Final Answer:

1.1 mL

Educational Insight

Reconstituting powdered medications like cefazolin requires careful attention to the resulting concentration, as it directly impacts dosing accuracy. This question highlights the importance of dividing the prescribed dose by the concentration obtained after reconstitution. Since IM injections require precision and typically involve small volumes, rounding to the nearest tenth ensures both accuracy and safe administration. Proper technique in reconstitution and dose calculation helps ensure effective treatment and minimizes complications.