Microalbumin tests are measured as milligrams of microalbumin protein that leak into the patient's urine over the course of 24 hours, according to Mayo Clinic. A result of less than 30 milligrams is considered normal, a measurement between 30 and 300 milligrams indicates the earlier stages of kidney disease, and higher levels indicate advanced kidney disease.
To conduct a microalbumin test, the patient provides a fresh urine sample by collecting all of her urine in a special container over a 24-hour period, by taking a single urine sample after at least four hours without urinating or by doing a single random urine test. After providing the test, it is submitted to a laboratory for analysis, and the patient can resume her normal activities.
When albumin levels in the urine are higher than normal, the condition is referred to as microalbuminuria. When the levels are in the very high range corresponding to advanced kidney disease, the condition is referred to as macroalbuminuria. If urinary microalbumin levels are higher than normal, a doctor may recommend repeating the test. Blood in the urine, certain medications, the presence of a fever, intense exercise and a urinary tract infection can cause microalbumin levels to be higher than expected, states Mayo Clinic.