Tests and diagnosisBy Mayo Clinic staff
If your signs and symptoms suggest that you have acute kidney failure, your doctor may recommend tests and procedures to verify your diagnosis. These may include:
- Urine output measurements. The amount of urine you excrete in a day may help your doctor determine the cause of your kidney failure.
- Urine tests. Analyzing a sample of your urine, a procedure called urinalysis, may reveal abnormalities that suggest kidney failure.
- Blood tests. A sample of your blood may reveal rapidly rising levels of urea and creatinine — two substances used to measure kidney function.
- Imaging tests. Imaging tests such as ultrasound and computerized tomography (CT) may be used to help your doctor see your kidneys.
- Removing a sample of kidney tissue for testing. In certain situations, your doctor may recommend a kidney biopsy to remove a small sample of kidney tissue for lab testing. To remove a sample of kidney tissue, your doctor may insert a thin needle through your skin and into your kidney.
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