This is Dr Basu, experienced Internal Medicine Specialist.
I am here to address your concerns and provide great service.
This level suggests very mild level of protein leakage from the kidneys.
Can be early onset kidney disease.
Diabetes, hypertension are common causes--should be checked.
Physical exertion, high protein diet also can cause this --which will be harmless cause.
But do see a doctor for checking diabetes, hypertension.
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