Serum calcium measurement quantifies the total concentration of calcium (bound and free) in blood. Calcium is essential for neuromuscular function, blood coagulation, bone metabolism, and cellular signaling. Abnormal serum calcium levels may indicate parathyroid disorders, bone disease, renal dysfunction, or vitamin D imbalances.
Parameter Details
Analyte Total calcium (Ca²⁺)
Specimen type Serum (5 mL clotted blood in serum separator tube)
Collection & handling Separate serum within 2 hours; avoid hemolysis; transport at 2–8 °C; analyze within 24 hours or freeze at –20 °C for longer storage.
Assay methodology Colorimetric assay (o-cresolphthalein complexone) or atomic absorption spectrophotometry.
Turn-around time 1 working day
Reference interval 8.4 – 10.2 mg/dL (2.10 – 2.55 mmol/L); method- and age-specific ranges may vary.
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