Serum Sodium Concentration Change Considering Infused and Excreted Cations

Sex Male (0.6)

Female (0.5)
Vol Infusate
Vol Urine
Na Infusate
Na Serum
Na Urine
K Infusate
K Urine
Vol Delta
Na Change
Decimal Precision:
TBW = Sex * Weight
VolDelta = VolInfusate - VolUrine
NaChange = ((VolInfusate * (NaInfusate + KInfusate)) - (VolUrine * (NaUrine + KUrine)) - (VolDelta * NaSerum)) / (TBW + VolDelta)
  • Equation parameters such as Sex have two or more discrete values that may be used in the calculation. The numbers in the parentheses, e.g. (0.6), represent the values that will be used.
  1. Barsoum NR, Levine BS. Current prescriptions for the correction of hyponatraemia and hypernatraemia: are they too simple?. Nephrol Dial Transplant. 2002 Jul;17(7):1176-80.
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