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calcium, ionised in the blood

Name calcium, ionised in the blood
Specimen requirements 1 ml of heparin blood
Notes and interpretation With every change in the total protein and especially the albumin, or if there is dysproteinaemia, the determination of the biologically activated, ionised calcium is clearly superior to that of the total calcium. However, this is more difficult to carry out, requiring a pH correction and immediate centrifuging of the blood or the use of heparinised whole blood.
Albumin-corrected calcium is an alternative that is determined much more easily than ionised calcium and is calculated according to the following formula:
Ca, corr. (mmol/l) = Ca (mmol/l) - (0.025 x albumin (g/l) + 1