In renal glycosuria, the renal threshold for glucose stands at_______________?
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Answer: A. Low
Explanation
Renal glycosuria occurs when the renal threshold for glucose reabsorption is abnormally low, causing glucose to spill into the urine at normal blood levels. Proximal tubules fail to reabsorb filtered glucose completely due to transporter defects despite normal systemic glycemia. This condition demonstrates that urinary excretion depends heavily on both filtered load and carrier protein transport limits. The kidneys filter and reabsorb glucose efficiently, normally preventing any sugar from appearing in the final urine. The renal threshold represents the plasma glucose concentration at which tubular transport maximum capacity is exceeded. Benign renal glycosuria is usually an inherited condition that does not cause systemic diabetic complications.
A high renal threshold would mean the kidneys retain glucose even at elevated blood sugar levels, which does not cause glycosuria. A normal unchanged threshold would not result in urinary glucose excretion when systemic blood glucose levels are completely normal. A greatly increased threshold would prevent glucose excretion even during periods of significant hyperglycemia.
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