Glucosuria is NOT normally present.

• A. False
• B. Sometimes
• C. True
• D. Never

Answer: (C)

Glucose is filtered by the kidneys and then almost entirely reabsorbed in the proximal tubule up to a renal threshold of about 180 mg/dL. In healthy individuals, plasma glucose rarely exceeds this threshold, so urine glucose is not present. Glucosuria appears only when blood glucose is high enough to spill into urine or when tubular reabsorption is impaired. Because glucosuria should not be seen under normal conditions, the statement is true. If glucosuria is detected, it points to hyperglycemia (as in diabetes) or proximal tubule dysfunction, not a normal finding.