Abnormal Microalbumin But Normal ACR.

Having persistent foamy urine since June 2025 Recent & previous serum creatinine,blood urea & potassium levels are all normal.USG (KUB) done on April & 24 hrs urine protein done on July are all normal Urine ACR & all it's other parameters came normal on june,july & august This time Microalbumin came 2.30 mg/dl (ref range 0-1.7),Urinary Creatinine came 142.10 mg/dl (ref range 22-328) & ACR came 16.19 Microalbumin level has crossed the upper normal limit of the reference range There has been a significant rise in Microalbumin & ACR levels in comparision to the previous reports Had adequate hydration (2.7 ltrs) & no protein diet the day before What might be the reason of such abnormal elevation of Microalbumin ?