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Specific Findings

Sensitive Findings

Prerenal Kidney Failure: Sensitivity and Specificity

Introduction: Acute kidney failure is generally divided into 3 categories: renal, pre-renal, and post-renal causes. Pre-renal causes are those that result from hypoperfusion of the kidneys, principally hypovolemia and cardiogenic shock.

The most common causes of ARF are prerenal failure and ATN.

Another reference study is Ann Intern Med. 1978 Jul;89(1):47-50 PMID: 666184.

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Tags: Renal Tag this Diagnosis.

The sensitivity and specificity of findings for Prerenal Kidney Failure are listed below. See the left navigation bar to change the display.

Pre-Test Probability (Prevalence): %. Post-Test Probability (Predictive Value): %. Switch to display mode.
**Note that calculating probabilities from more than one finding is inherently inaccurate because findings are not independent. (For example, using two positive findings that share a common pathogenesis is likely to overestimate the true probability.)
Sensitive and Specific Findings
FindingResult SensitivitySpecificity
[ + ] Fractional Excretion of Urea + 0 - 89.6%96%
Specific Findings
FindingResult SensitivitySpecificity
[ + ] Fractional Excretion of Sodium + 0 - 76.6%96%
[ + ] Urine Sodium to Potassium Ratio + 0 - 66.2%92%
[ + ] Urine Creatinine to Plasma Creatitine Ratio + 0 - 80.5%88%
Sensitive Findings
FindingResult SensitivitySpecificity
[ + ] Elevated BUN to Creatinine Ratio + 0 - 87%80%