The nurse is preparing to administer 0.25 mg of bumetanide. It is available at 1 mg/4 ml. How many ml should be administered?

To determine the volume in milliliters to administer 0.25 mg of bumetanide when it is available at a concentration of 1 mg in 4 ml, the first step is to establish how many milliliters correspond to the required dose.

Start with the concentration: 1 mg is contained in 4 ml. This means that for every milligram of bumetanide, you are administering 4 ml.

To find out how many milliliters contain 0.25 mg, you can set up a proportion. Since 1 mg is in 4 ml, you can calculate the volume that corresponds to 0.25 mg:

[

\text{Volume for 0.25 mg} = 0.25 , \text{mg} \times \frac{4 , \text{ml}}{1 , \text{mg}}

]

This calculation results in:

[

0.25 \times 4 = 1 , \text{ml}

]

Thus, 1 ml of the solution is needed to deliver 0.25 mg of bumetanide. This is why the correct answer is 1 ml.