Final answer:
The important procedure when drawing blood at a patient's home and not in a hospital building is disposing of used needles in a sharps container.
Step-by-step explanation:
The procedure that is important when drawing blood at a patient's home and is not necessary in a hospital building is disposing of used needles in a sharps container. When drawing blood at a patient's home, it is crucial to properly dispose of used needles in a designated sharps container to prevent injury and potential transmission of infections.