test GFR using
convenient and reproducible marker
freely filtered, not reabsorbed or secreted marker
(creatinine normal blood is .7-1.4 mg/dl)
Ccr=Ucr x V/Pcr
U= urine P=plasma C=clearance
Normal range is 95-105 ml/min
used to bedside assessment-->no urine collected
Ccr=[(140-age) x mas in kilograms]/( 72 x Pcr)
x .85 for women
final breakdown of protein metabolism
freely filtered , not secreted but reabsorbed in tubules
usually BUN:CR is 10-20:1
disproportionately highBUN indicates
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