Albumin is a protein that is normally found in the blood, and ordinarily the kidneys prevent most albumin from entering urine. A urine microalbumin test checks the levels of small quantities(20-200mg/L) albumin present urine, because abnormal amounts of this protein can be a sign of Kidney problems in patients who have diabetes or high blood pressure, one of the things to look out for is kidney disease. A microalbumin urine test helps because it can find kidney problems before they get too far. 24H or morning urine are the sample of choice