Oliguria: Causes and Effects of Decreased Urine Output

8. Diagnosis

There are multiple ways to diagnose the underlying cause of oliguria. One is a 24-hour urine collection to measure exactly how much urine the patient produces in a day. A doctor may also take urine samples for analysis and blood tests to measure creatinine and urea, two markers that measure kidney function. If the physician suspects kidney damage, an ultrasound or CT scan can evaluate the severity. Some cases may also require a biopsy.