Final answer:
To administer a dose of 15 mg ketorolac when the concentration is 30 mg/ml, the nurse would prepare and administer ½ ml of the medication.
Step-by-step explanation:
If a primary health care provider prescribes ketorolac 15 mg intramuscularly and the medication label states ketorolac 30 mg per ml, the nurse would need to calculate the correct volume to administer.
The calculation is straightforward and can be set up as a simple proportion.
Since there are 30 mg of ketorolac in every 1 ml, to administer 15 mg,
the nurse would need ½ ml (15 mg × 1 ml / 30 mg = 0.5 ml).
So, the nurse would prepare ½ ml of ketorolac for administration.