What is the role of spot protein/spot creatinine ratio in the diagnosis of systemic lupus erythematosus (SLE)?

Updated: Aug 04, 2021
  • Author: Christie M Bartels, MD, MS; Chief Editor: Herbert S Diamond, MD  more...
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The spot protein/spot creatinine ratio may be used to quantify proteinuria. The 2012 ACR guidelines for lupus nephritis noted that a spot protein/spot creatinine ratio greater than 0.5 g/day can substitute for the 24-hour protein measurement and that an active urinary sediment (defined as >5 red blood cells [RBCs] per high-power field [hpf]; >5 white blood cells [WBCs]/hpf in the absence of infection; or cellular casts limited to RBC or WBC casts) can substitute for cellular casts. [102]

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