<prompt> Microalbuminuria is defined as protein level is in the range of:30-200 mgday30-300 mgday30-150 mgday30-100 mgday  <response>: Microalbuminuria refers to urinary albumin excretion of 30-300 mgday. It represents the earliest manifestation of diabetic nephropathy and identifies patients at risk for developing ove nephropathy as well as a progressive decline in renal function. Values greater than 300 are referred to as macroalbuminuria. Ref: Taal M.W. 2009. Chapter 22. Slowing the Progression of Chronic Kidney Disease. In E.V. Lerma, J.S. Berns, A.R. Nissenson Eds, CURRENT Diagnosis Treatment: Nephrology Hypeension. 