A kidney tray, also sometimes called a kidney dish, is a medical instrument used to hold various items during surgical procedures. They are shaped like a kidney, with a round indentation on one side and a flat surface on the other. Kidney trays are made of stainless steel or plastic and are available in a variety of sizes.
 
They are used to hold a variety of items during surgery, including:
Instruments
Sponges
Sharps containers
Tissue specimens
Blood and other fluids
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