Micro albuminuria requires further evaluation for renal parenchymal diseases (different types of glomerulonephritis,other renal parenchymal diseases)
Commonest glomerulonephritis is basement membrane glomerulonephritis or Berger's disease
Diabetes,hypertension,chronic pyelonephritis,few drug intakes can also lead to renal parenchymal diseases
Creatininealbumin ratio is also a useful test.Sometimes a Rena biopsy may be required.Consult a nephrologist for full clinical evaluation as course of disease can be modified by rrugs