LECURE 3 RENAL FUNCTIONS TESTS AND ALGORITHMS

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why measure GFR?
identifying & diagnosing renal disease, monitoring disease progression
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Renal clearance definition (ml/min)
volume of plasma from which all trace of a substance is removed per unit time
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2 substances representing in renal clearance by kidneys
inulin and creatinine
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what is inulin
inert, dietary polysaccharide
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what is creatinine
breakdown product of muscle creatine
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how is renal plasma flow (RPF) measured
by determining the renal clearance of p-aminohippuric acid (PAH).
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properties of a substance used to measure GFR
freely filtered by glomerulus, not secreted or reabsorbed by tubules, and not metabolised
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the substance must not what?
not influence what’s being measured
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properties of substance to measure RPF
actively secreted and not reabsorbed by tubules, not metabolised
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what can be used as a substitute for renal clearence measurements
GFR algorithms
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2 most well known GFR algorithms
Cockcroft-Gault (CG) formula and the Modification of Diet in Renal Disease (MDRD) Study formula
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what are GFR algorithms dependent on
finding a stable plasma creatinine value
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why can these GFR algorithms be problematic?
variable plasma creatinine levels e.g muscle gain
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Card 2

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Renal clearance definition (ml/min)

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volume of plasma from which all trace of a substance is removed per unit time

Card 3

Front

2 substances representing in renal clearance by kidneys

Back

Preview of the front of card 3

Card 4

Front

what is inulin

Back

Preview of the front of card 4

Card 5

Front

what is creatinine

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