Question

order: heparin 2500 units, subq every 6 hours
supply: heparin 10,000 units/ml

Explanation:

Step1: Set up proportion

Let $x$ be the volume in mL. The proportion is $\frac{2500\text{ units}}{x\text{ mL}}=\frac{10000\text{ units}}{1\text{ mL}}$.

Step2: Cross - multiply and solve for $x$

$10000x = 2500\times1$. Then $x=\frac{2500}{10000}$.

Step3: Simplify the fraction

$x = 0.25$ mL.

Answer:

$0.25$ mL