This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
A long term diabetic patient found to have microalbuminuria. He may excrete the proteins at the range of: 
Select and explain. 
A. 100 - 150 mg/day, B. 30 - 300 mg/day, C. 201 - 300 mg/day, D. 301 - 600 mg/day
B: 30 - 300 mg/day
Answer: B: 30 - 300 mg/day 
Explanation: Proteinuria > 150 mg/day is considered abnormal. Microalbuminuria refers to urinary albumin excretion of 30-300 mg/day. Microalbuminuria is commonly used to detect early renal disease in diabetic patients, and so is mainly used in the primary care setting rather than the inpatient setting. When proteinuria exceeds 3.5 g/day, it is in the nephrotic range, and when accompanied by hypoalbuminemia, edema, and hyperlipidemia, full-blown nephrotic syndrome is present. Ref: Schaffer A.C. (2012). Chapter 104. Urinalysis and Urine Electrolytes. In G.V. Lawry, S.C. McKean, J. Matloff, J.J. Ross, D.D. Dressler, D.J. Brotman, J.S. Ginsberg (Eds), Principles and Practice of Hospital Medicine.