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Thursday, August 07, 2008
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Renal Equations
GFR based on MDRD equation
Cockcroft and Gault equation: Estimated Creatinine Clearence
Measured Creatinine Clearence
FEna: Fractional Excretion of Sodium
TTKG: Trans-tubular potassium gradient
Urine Net Charge
GFR Estimation using the MDRD
Equation (Modification of Diet in Renal Disease Study Group)
GFR = (170 x (PCr )exp[-0.999]) x (Age exp[-0.176]) x ((SUrea)exp[-0.170]) x ((Albumin )exp[+0.318])
Select Unit:
std units
SI units
Plasma Creatinine
Gender
Male
Female
Serum BUN
Race
White
Black
Albumin
Age (years)
GFR (per 1.73 m2)
l/min
ml/hr
ml/min
ml/sec
to top
Cockcroft and Gault equation: Estimated Creatinine Clearence
Creatinine Clearence = 140-Age*Weight (Kg)/ 72*Serum creatinine (* 0.85 for feamles)
Select Unit:
std units
SI units
Age (years)
Weight (kg)
Kg
Lbs
Serum Creatinine
Gender
Male
Female
CrCl
l/min
ml/hr
ml/min
ml/sec
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Measured Creatinine Clearence
Creatinine Clearence = Ucr * Uv/Pcr *1440
Select Unit:
std units
SI units
Urine Creatinine
Urine Volume (mL/day)
Serum Creatinine
Creatinine Clearence: CrCl
l/min
ml/hr
ml/min
ml/sec
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Fractional Excretion of Sodium
FE
Na
= [Urine Na]*[Plasma Cr]/[Urine Cr]*[Plasma Na]
Select Unit:
std units
SI units
Urine Sodium
Urine Creatinine
Serum Sodium
Serum Creatinine
FE
Na
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Trans-Tubular K
+
Gradient
TTKG = [Urine K]*[Plasma Osm]/[Urine Osm]*[Plasma K]
Parameters
Urine Potassium
Urine Osmolality
Serum Potassium
Serum Osmolality
TTKG
to top
Urine Net Charge Calculator
Parameters
Urine Na
Urine K
Urine Cl
Urine Net Charge
Normal = negative
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