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Hypocalcaemia : Calcium Carbonate; Risedronate Sodium Vs. Calcium Chloride

Definition

In medicine, hypocalcaemia (or hypocalcemia) is the presence of low serum calcium levels in the blood, usually taken as less than 2.1 mmol/L or 9 mg/dl or an ionized calcium level mm of less than 1.1 mmol/L (4.5 mg/dL). It is a type of electrolyte disturbance. In the blood, about half of all calcium is bound to proteins such as serum albumin, but it is the unbound, or ionized, calcium that the body regulates. If a person has abnormal levels of blood proteins, then the plasma calcium may be inaccurate. The ionized calcium level is considered more clinically accurate in this case. In the setting of low serum albumin (frequently seen in patients with chronic diseases, hepatic disease or even long term hospitalization), the formula for corrected calcium is: CorrCa = Measured serum Ca + [(4.0 - measured serum albumin) * 0.8]. Thus, if the albumin is low, the measured calcium may appear low when in fact it is physiologically within normal limits.

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