<prompt> A 21-year-old woman presents with a 2-day history of abdominal pain, nausea, and vomiting. On examination, her blood pressure is 10070 mmHg, pulse 100min, JVP is below sternal angle, and abdomen is diffusely tender. Her urine output is low and electrolytes reveal elevated urea and normal creatinine.For the above patient with AKI, select the characteristic urine electrolyte and microscopy findings.urinary osmolality 100oxalate crystals in the urineurinary sodium 20fractional sodium excretion 1  <response>: In prerenal AKI ie, no histologic damage, the urinalysis reveals only hyaline casts. The urine sodium is low 20, the urinary osmolality is high 500, and the fractional excretion of sodium is 1. 