A patient is to receive 1000 units of heparin. If 5000 units/mL is available, how many mL will you administer?

To determine how many mL of heparin to administer, we start by using the concentration of the solution available, which is 5000 units/mL. The goal is to achieve a dosage of 1000 units for the patient.

First, we need to set up a simple proportion based on the concentration:

1. We have a concentration of 5000 units in every 1 mL.

2. To find out how many mL corresponds to 1000 units, we set up the equation:

[ \text{mL needed} = \frac{1000 \text{ units}}{5000 \text{ units/mL}} ]

By calculating this:

[ \text{mL needed} = \frac{1000}{5000} = 0.2 \text{ mL} ]

This calculation shows that to achieve a dosage of 1000 units of heparin, the nurse should administer 0.2 mL. Thus, the correct answer reflects the appropriate volume required to deliver the specified dose based on the concentration of the medication available.