Question

order: enoxaparin (lovenox) 30 mg, subq, twice daily post hip surgery
supply: lovenox 40 mg/0.4 ml

Explanation:

Step1: Set up proportion

Let $x$ be the volume in mL to be administered. We set up the proportion $\frac{40\ mg}{0.4\ mL}=\frac{30\ mg}{x\ mL}$.

Step2: Cross - multiply

$40x = 30\times0.4$.

Step3: Solve for $x$

$40x=12$, then $x=\frac{12}{40}=0.3$ mL.

Answer:

$0.3$ mL