A client with chronic kidney disease receives a prescription for darbepoetin alfa 40 mcg subcutaneous every 7 days. The darbepoetin alfa vial is labeled, "60 mcg/mL." How many mL should the nurse administer?

To calculate the amount of darbepoetin alfa that the nurse should administer, you can use the following formula: Dose (mL) = Amount prescribed (mcg) / Concentration (mcg/mL) In this case: Amount prescribed = 40 mcg Concentration = 60 mcg/mL Dose (mL) = 40 mcg / 60 mcg/mL = 2/3 mL Now, you can convert 2/3 mL to decimal to make it easier to work with: 2/3 = 0.6667 mL Rounded to one decimal place, the nurse should administer approximately 0.7 mL of darbepoetin alfa. So, the correct answer is 0.7 mL.