Management of Microalbuminuria

Interpretation of Results

• The American Journal of Kidney Diseases and Diabetes Care define normal albumin-to-creatinine ratio (ACR) as <30 mg/g creatinine, which is the case for a patient with an ACR of 9 mg/g 1, 2, 3
• The threshold for microalbuminuria is defined as an ACR of 30-300 mg/g creatinine by Diabetes Care and Kidney International 2, 4
• The terms "microalbuminuria" and "macroalbuminuria" are being phased out in favor of categories of "increased urinary albumin excretion" (≥30 mg/g) by Diabetes Care 5

Recommended Follow-up

• The American Diabetes Association, as reported in Diabetes Care, recommends continuing annual screening for albuminuria, especially if the patient has diabetes, hypertension, or other risk factors for chronic kidney disease 3, 6
• First morning urine samples are preferred to avoid confounding effects like orthostatic proteinuria, according to the American Journal of Kidney Diseases 1
• Maintaining optimal blood pressure and glycemic control is recommended as preventive measures by Diabetes Care 2, 7

Risk Assessment and Prevention

• The American Diabetes Association, as reported in Diabetes Care, recommends assessing other risk factors for chronic kidney disease, including presence of diabetes, hypertension, family history of kidney disease, and ethnicity 3, 6, 7
• Preventive measures to maintain normal ACR include optimizing glycemic control if diabetic and maintaining blood pressure <130/80 mmHg, as recommended by Diabetes Care 2, 6, 7

Technical Considerations for Future Testing

• The American Journal of Kidney Diseases recommends using morning spot urine samples for consistency and avoiding vigorous exercise for 24 hours before sample collection 1
• Certain conditions can temporarily increase albumin excretion, such as fever, urinary tract infection, heart failure, and marked hyperglycemia, according to Diabetes Care 8

When to Consider Additional Evaluation

• If future ACR measurements show values ≥30 mg/g, confirmation with two additional measurements over a 3-6 month period is recommended by the American Journal of Kidney Diseases and Diabetes Care 1, 3
• Consider ACE inhibitor or ARB therapy if persistent albuminuria is confirmed, especially in patients with diabetes or hypertension, as recommended by Diabetes Care 2, 7

Pitfalls to Avoid

• Don't overinterpret a single normal ACR value, as albumin excretion can vary day-to-day, according to the American Journal of Kidney Diseases 1
• Don't assume a normal ACR rules out early kidney disease in all cases, as some patients may develop reduced GFR without albuminuria, particularly in type 2 diabetes, as reported in Diabetes Care 5, 6