The term "Eck fistula experiment" refers to a scientific investigation conducted on animals, usually rats, to study renal physiology. Synonyms for this term could include "Eck fistula procedure", "renal fistula experiment" or "renal fistula study". These synonyms are commonly used in scientific literature and research papers to describe the same experimental technique. The Eck fistula experiment involves surgically creating a connection between the renal artery and vein, as well as externalizing the ureter, allowing for precise control in measuring urine output and analyzing various renal functions. Such experiments help deepen our understanding of kidney physiology and contribute to advancements in medical knowledge.