Abnormal results may mean your kidneys are starting to get damaged. But the damage may not yet be bad.
Abnormal results may also be reported as:
Range of 20 to 200 mcg/min
Range of 30 to 300 mg/24 hours
You will need more tests to confirm a problem and show how severe the kidney damage may be.
Read more https://medlineplus.gov/ency/article/003591.htm