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Diagnostic Approach: Differential Diagnosis, Physical Exam, Lab Tests, Imaging, and Novel Biomarkers

  • Aparna Sharma
  • Jay L. Koyner
Chapter

Abstract

Traditionally, acute kidney injury (AKI) has been classified into prerenal, intrinsic renal/intrarenal, and post-renal categories. If diagnosed early, pre- and post-renal AKI may be readily reversible, and thus earlier diagnosis may not only mitigate the severity of the AKI but potentially the morbidity and mortality that are associated with it. A revamped classification has been proposed by some authors based upon the presence or absence of changes in functional and structural/injury biomarkers. Patients without a change in either biomarker would be classified as having no AKI, while those who have changes in both are thought to have severe intrinsic AKI (e.g., ATN). A change in functional biomarkers without change in injury biomarkers would be classified as prerenal AKI, while changes in their injury biomarkers without a concomitant change in functional biomarkers may be viewed as being “subclinical AKI.”

The approach to any patient with AKI requires detailed attention to physical exam findings (which may often be subtle), several blood and urine tests (including examination of the urinary sediment), and potentially a variety of imaging test. Urinary indices such as FENa and FEUrea may aid in the differential diagnosis but have not been validated in all settings. Ultrasound is often the first-line imaging modality in the initial evaluation of AKI given its inexpensive nature, wide availability, and absence of complications. Newer imaging modalities including the blood oxygen level-dependent magnetic resonance imaging (BOLD MRI) are emerging and may prove useful in the setting of AKI. Given that serum creatinine is an imperfect marker of renal function, various biomarkers such a NGAL and TIMP-2*IGFBP7 have been studied extensively in a variety of clinical settings (e.g., sepsis, cardiac surgery). While several of these biomarkers have become available for clinical use in the last few years, none of them have gained widespread acceptance. To date no new biomarker has been incorporated into new definitions of AKI.

Keywords

Acute kidney injury Acute renal failure Physical exam Renal imaging Biomarkers Serum creatinine Neutrophil gelatinase-associated lipocalin (NGAL) Tissue inhibitor metalloproteinase-2 and insulin-like growth factor-binding protein-7 (TIMP-2*IGFBP7) 

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Section of Nephrology, Department of MedicineUniversity of ChicagoChicagoUSA

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