Final answer:
An IV solution called normal saline is hung with a blood transfusion to provide fluids and maintain electrolyte balance.
Step-by-step explanation:
When a blood transfusion is needed, an intravenous (IV) solution called normal saline is typically hung along with the blood. Normal saline is a solution of sodium chloride (salt) in water, with a concentration of 0.9%. It is used to provide fluids and maintain the balance of electrolytes in the body during the transfusion.