QuestionSBA
QuestionChoice
At a steady arterial concentration, the rate infused is equal to the rate urinated out, and if a substance is freely filtered and not reabsorbed or actively excreted, its clearance is equal to the GFR.
Clearance x arterial concentration = urinary rate x urinary concentration = infusion rate x infusion concentration
GFR = (infusion rate x infusion concentration)/arterial concentration
GFR = (50ml/min x 250umol/L)/100umol/L
GFR = 50ml/min x ((250umol/L)/(100umol/L)) = 50ml/min x 2.5 = 125ml/min
10001206
a
125ml/min
QuestionChoice
At a steady arterial concentration, the rate infused is equal to the rate urinated out, and if a substance is freely filtered and not reabsorbed or actively excreted, its clearance is equal to the GFR.
Clearance x arterial concentration = urinary rate x urinary concentration = infusion rate x infusion concentration
GFR = (infusion rate x infusion concentration)/arterial concentration
GFR = (50ml/min x 250umol/L)/100umol/L
GFR = 50ml/min x ((250umol/L)/(100umol/L)) = 50ml/min x 2.5 = 125ml/min
10001207
b
120ml/min
QuestionChoice
At a steady arterial concentration, the rate infused is equal to the rate urinated out, and if a substance is freely filtered and not reabsorbed or actively excreted, its clearance is equal to the GFR.
Clearance x arterial concentration = urinary rate x urinary concentration = infusion rate x infusion concentration
GFR = (infusion rate x infusion concentration)/arterial concentration
GFR = (50ml/min x 250umol/L)/100umol/L
GFR = 50ml/min x ((250umol/L)/(100umol/L)) = 50ml/min x 2.5 = 125ml/min

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10001210
e
25ml/min
QuestionChoice
At a steady arterial concentration, the rate infused is equal to the rate urinated out, and if a substance is freely filtered and not reabsorbed or actively excreted, its clearance is equal to the GFR.
Clearance x arterial concentration = urinary rate x urinary concentration = infusion rate x infusion concentration
GFR = (infusion rate x infusion concentration)/arterial concentration
GFR = (50ml/min x 250umol/L)/100umol/L
GFR = 50ml/min x ((250umol/L)/(100umol/L)) = 50ml/min x 2.5 = 125ml/min
10001209
d
20ml/min
QuestionChoice
At a steady arterial concentration, the rate infused is equal to the rate urinated out, and if a substance is freely filtered and not reabsorbed or actively excreted, its clearance is equal to the GFR.
Clearance x arterial concentration = urinary rate x urinary concentration = infusion rate x infusion concentration
GFR = (infusion rate x infusion concentration)/arterial concentration
GFR = (50ml/min x 250umol/L)/100umol/L
GFR = 50ml/min x ((250umol/L)/(100umol/L)) = 50ml/min x 2.5 = 125ml/min
10001208
c
100ml/min
Concept
Chapter
2693
3894
Glomerular Filtration Rate
Topic
170
Clinical Chemistry
12788
A patient is infused with inulin at a constant rate until arterial concentration stabilises at 100uM. The infusion concentration of inulin is 250uM, and the patient is infused with 50ml of this solution per hour.

Assuming inulin is freely filtered and not reabsorbed, what is the patient's GFR?
a