original_query: What is renal angina and how does it help in risk stratifying patients for acute kidney injury?
query: What is renal angina and how does it help in risk stratifying patients for acute kidney injury?
answer: Renal angina is a clinical methodology to risk stratify patients for the development of persistent and severe acute kidney injury (AKI). It's a composite of risk factors and early signs of injury used as a clinical adjunct to optimize novel AKI biomarker testing.  It helps predict severe and persistent AKI by integrating baseline, contextual, and clinical evidence of kidney injury, guiding the use of AKI biomarker tests to patients who would benefit most.