COMMONLY USED FORMULAS
Output  =
Entered  Variables
A-a gradient =
713 X Fio2 -(pCO2/0.8)-observed pO2
BSA  =
 
 SQUARE ROOT ( height  [cm] X  weight = [kg] /3600)
Corrected calcium  =
 
measured calcium [mg/dl] +(0.8 )X(4-albumin  [g/dl])
Creat clearance 
  .85 X ((140 - age  (yr) ) X  weight  (kg) )
                 (72 X serumCr  (mg/dL)) 
FE Na 
  urine Na   /plasma Na      X100   <1 pre-renal 
  urine creat/plasma creat              >1 (ATN) renal
IBW (kg) =
 Frame
small medium largeHeight (inches)

 
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