Definition
- Glucose is reabsorbed completely from the tubular fluid in the proximal tubule, by secondary active transport linked to Na+ reabsorption.
- Normally almost all filtered glucose (100 mg/min) is reabsorbed, so urine is essentially glucose free.
Normal Values
Normal values in glucose filtration and reabsorption
Parameter
Normal plasma glucose
- Value
- 80 mg/dL
GFR
- Value
- 125 mL/min
Filtered glucose load
- Value
- 100 mg/min
TmG, males
- Value
- 375 mg/min
TmG, females
- Value
- 300 mg/min
Predicted renal threshold (TmG ÷ GFR)
- Value
- about 300 mg/dL
Actual renal threshold, arterial plasma
- Value
- about 200 mg/dL
Actual renal threshold, venous plasma
- Value
- about 180 mg/dL