Ramirez-Sandoval et al reported an equation for estimating free (ionized) calcium in the serum. The authors are from Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán and Universidad Panamericana in Mexico City.
Parameters:
(1) total calcium in mmol/L
(2) serum albumin in g/L
(3) serum phosphate in mmol/L
(4) serum CO2 in mmol/L
Parameter
Points
serum calcium
0.541 * (total calcium)
serum albumin
- 0.0067 * (albumin)
serum phosphate
- 0.0425 * (phosphate)
serum CO2
- 0.003 * (CO2)
estimated serum free/ionized calcium in mmol/L =
= SUM(points for all of the parameters)
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