How is renal function evaluated in the workup of thrombotic thrombocytopenic purpura (TTP)?

Updated: May 25, 2021
  • Author: Theodore Wun, MD, FACP; Chief Editor: Srikanth Nagalla, MD, MS, FACP  more...
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Evaluation of renal function with a blood urea nitrogen (BUN) and creatinine level is necessary to establish the presence and severity of renal impairment. This also aids in differentiating HUS from TTP, but patients classified as TTP in some studies have had an elevated creatinine level and those with HUS have had neurologic abnormalities, again emphasizing that these are clinical diagnoses.

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