Final answer:
The spleen is the organ that is commonly removed due to trauma, a blood condition, or as a staging procedure for malignancy.
Step-by-step explanation:
The organ that is commonly removed due to trauma, a blood condition, or as a staging procedure for malignancy is the spleen. The spleen is a secondary lymphoid organ that acts as the filter for the blood, removing microbes and dying red blood cells. It also plays a role in immune responses to blood-borne pathogens.