Ancillary Tests

Microscopic examination of urine is very useful in establishing the differential diagnosis of ARF ( TabJe.88-6). While changes in urine output are poorly correlated with changes in GFR, the categories of anuria, oliguria, and nonoliguria can be useful in the differential diagnosis of ARF ( Table.88:Z). Approximately 50 to 60 percent of all causes of ARF is nonoliguric.

TABLE 88-6 Differential Diagnosis of Acute Renal Failure (ARF) According to Urinalysis

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TABLE 88-7 Differential Diagnosis of Acute Renal Failure (ARF) According to Urine Volume

To help differentiate prerenal failure from ATN, chemical analysis of the urine may provide important clues 19 (Iab!§88:8). The fractional excretion of sodium (FeNa) is a test that is commonly used but, unfortunately, fails to distinguish prerenal causes of ARF from other causes of ARF 20 (IaM§J8§:9)-

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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