A 65-year-old female with a past medical history of nephrolithiasis presents to a clinic for a routine checkup. Flat plate abdominal x-ray did not show any evidence of nephrolithiasis. Blood workup revealed serum calcium levels of 9.2 mg/dL, serum uric acid level of 6.5 mg/dL, and serum creatinine level of 1.1 mg/dL. A 24-hour urinary test analysis report showed a uric acid level of 750 mg, urinary oxalate 45 mg, urinary citrate 320 mg, urinary calcium 584 mg/L, and a 24-hour urinary volume of 850 mL. Which of the following problem is essential to fix while performing 24-hour urine testing for nephrolithiasis interpretation in this patient?

1.Hypercalciuria
2.Hyperoxaluria
3.Hypercitraturia
4.Low urinary volume

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