What is overflow proteinuria?

Updated: Mar 25, 2020
  • Author: Beje Thomas, MD; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Overflow proteinuria is most commonly associated with increased production of abnormal low molecular weight proteins (eg, light chains in multiple myeloma, myoglobin in rhabdomyolysis) that exceeds the reabsorption capacity of the proximal tubule, leading to spilling of the protein into the urine. These low molecular proteins can be toxic to the tubules and can cause acute kidney injury.  For example, paraprotein deposition can induce a glomerulopathy leading to the additional loss of albumin and more profound proteinuria.

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