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Renal Failure Index

The renal failure index is used to differentiate between renal and pre-renal acute renal failure.

The renal failure index is proportional to the serum creatinine density times the urine divided by the urine creatinine density. The fractional excretion of sodium equals serum creatinine density times the urine sodium concentration divided by the serum sodium concentration and the urine creatinine density.

Formula

{QuantityVariable["RFI", "Unitless"] == (Quantity[1, "Liters"/"Millimoles"]*QuantityVariable["Cr", "MassDensity"]*QuantityVariable[Subscript["U", "Na"], "Molarity"])/QuantityVariable[Subscript["U", "Cr"], "MassDensity"], QuantityVariable[Subscript["FE", "Na"], "Unitless"] == (QuantityVariable["Cr", "MassDensity"]*QuantityVariable[Subscript["U", "Na"], "Molarity"])/(QuantityVariable[Subscript["S", "Na"], "Molarity"]*QuantityVariable[Subscript["U", "Cr"], "MassDensity"])}

symbol description physical quantity
RFI renal failure index "Unitless"
Cr serum creatinine "MassDensity"
UCr urine creatinine "MassDensity"
UNa urine sodium "Molarity"
FENa fractional excretion of sodium "Unitless"
SNa serum sodium "Molarity"

Forms

Examples

Get the resource:

In[1]:=
ResourceObject["Renal Failure Index"]
Out[1]=

Get the formula:

In[2]:=
FormulaData[ResourceObject["Renal Failure Index"]]
Out[2]=

Use some values:

In[3]:=
FormulaData[ ResourceObject[ "Renal Failure Index"], {QuantityVariable["Cr","MassDensity"] -> Quantity[0.8`, ("Milligrams")/("Deciliters")]}]
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