A client is prescribed heparin 2,000 units SC q8 hours. The pharmacy sends heparin 5,000 units/mL. How many mL should the nurse administer every 24 hours?

Number 3 is correct.

Solution: Find the milliliters of heparin 5,000 units/mL the client will require per dose: 2,000 units × 1 mL/5,000 units = 0.4 mL . Multiply the volume of the dose by 3 to find the amount administered in 24 hours. (Administering a dose every 8 hours equals three doses in a 24-hour period.) 0.4ml × 3 doses/day = 1.2 mL/ day .