Which are the units of measurements for serum calcium and what is the conversion between them?
Serum calcium is expressed in conventional units, as mg/dL, in SI (Système International) units, as mmoles/L, and sometimes as mEq/L. Calcium has a molecular weight of 40 and its valence is 2. Therefore:
Calcium (mg/dL) × 0.25 = Ca (mmol/L)
Calcium (mg/dL) × 0.5 = Ca (mEq/L)
Calcium (mEq/L) × 0.5 = Ca (mmol/L)
