Nidus

A nidus refers to the central core or nucleus of a kidney stone or other calculus formation. This analysis identifies the composition and mass of the stone's innermost material, which is chemically distinct from outer layers. Understanding the nidus composition helps determine the underlying cause of stone formation—whether due to calcium oxalate, uric acid, infection, or other factors. This information is crucial for preventing recurrent stone formation through diet and lifestyle modifications.