<prompt> Proteinuria caused by tubule-interstitial renal disease is confirmed by excretion of -AlbuminLight chainImmunoglobulin ATamm-Horsfall protein  <response>: Tubular proteinuria is a result of tubulointersitial disease affecting the proximal renal tubules and interstitium. This results in decreased proximal reabsorption of proteins--in paicular, low molecular weight proteins generally below 25,000 Daltons such as beta-2 microglobulin light chain are excreted Ref Harrison20th edition pg 295 