With a renal threshold for glucose of 220 mg/dL, what is the expected response when a client has a blood glucose level of 400 mg/dL?
A. 400 mg/dL of excreted glucose in the urine
B. 220 mg/dL of excreted glucose in the urine
C. 180 mg/dL of glucose is excreted in the urine
D. No excreted glucose in the urine
C
Blood glucose is freely filtered at the glomerulus. Therefore, if a client has a blood sugar level of 400 mg/dl, the filtrate in the proximal convoluted tubule will have a glucose concentration of 400 mg/dL. With a renal threshold of 220 mg/dl, a total of 220 mg/dL of the 400 mg/dL will be reabsorbed back into the systemic circulation, and the final urine will have a glucose concentra-tion of 180 mg/dL.
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