Theoretical calculation of optimal depth in the percutaneous native kidney biopsy to drastically reduce bleeding complications and sample inadequacy for histopathological diagnosis

In recent years percutaneous native kidney biopsy (PNKB) has become of very common use and safe enough for the patient if performed by skilled physicians; nevertheless, haemorrhagic complications or inadequate tissue sample for the diagnosis may occur. We report here the type and the adequacy rate of specimens for diagnosis and complication rate associated with PNKB performed in a single centre from May 2003 to December 2005 using a mathematical formula to determine the depth in centimetre where pushing the trigger.