You Are Preparing to Draw Up a Dose of Heparin

You are preparing to draw up a dose of heparin to give subcutaneously to a patient. Which of the following represents the best procedure in preparing this injection?

A) Roll the vial between your hands in order to distribute the solution.
B) Insert the needle, then turn the vial upside down to distribute the drug
C) Shake the vial vigorously to adequately distribute the drug molecules.
D) Carefully draw the solution up from the vial without disturbing the contents.