Of the following blood glucose levels, which would you expect to result in glucose in the urine?

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Multiple Choice

Of the following blood glucose levels, which would you expect to result in glucose in the urine?

Explanation:
Glucose in urine appears only when blood glucose levels exceed the kidney’s reabsorption capacity. In the proximal tubules, glucose is reabsorbed by SGLT transporters up to a maximum rate; once plasma glucose rises above this renal threshold (about 180 mg/dL in many people), reabsorption saturates and glucose spills into the urine. Therefore, values well below that threshold will not produce glycosuria, while a value well above it will. Among the options, 225 mg/dL is above the threshold, so glucose would be present in the urine, whereas 60, 120, and 150 mg/dL are at or below the threshold and would not typically cause glucosuria.

Glucose in urine appears only when blood glucose levels exceed the kidney’s reabsorption capacity. In the proximal tubules, glucose is reabsorbed by SGLT transporters up to a maximum rate; once plasma glucose rises above this renal threshold (about 180 mg/dL in many people), reabsorption saturates and glucose spills into the urine. Therefore, values well below that threshold will not produce glycosuria, while a value well above it will. Among the options, 225 mg/dL is above the threshold, so glucose would be present in the urine, whereas 60, 120, and 150 mg/dL are at or below the threshold and would not typically cause glucosuria.

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