What is the concentration of the epoetin formulation described in the case?

• A. 2000 u/mL
• B. 1000 u/mL
• C. 400 u/mL
• D. 2500 u/mL

Answer: (A)

Concentration tells you how much epoetin is in each milliliter of the preparation, expressed in units per milliliter. In the case described, the product is labeled as 2000 units per milliliter, so every milliliter contains 2000 U of epoetin. That’s why this is the correct choice: the dose you give is scaled by this 2000 U/mL, for example 4000 U would be 2 mL, 1000 U would be 0.5 mL, and so on. The other numbers would only apply if the product were labeled differently or reconstituted to a different final volume, which isn’t described in the case.