Calcium is a plasma electrolyte which plays an important role in many physiological processes throughout the body. Measurement of total calcium includes both the unbound and bound fractions of calcium in the blood.
Plasma calcium may be requested in patients with symptoms of, or those at risk of, a disorder of calcium homeostasis.
Contamination with tube additives such as EDTA, oxalate and citrate will cause spuriously low calcium results. Calcium should only be measured on serum tubes or (balanced) lithium heparin tubes.
Paediatric Specimen - Heparin microtainer tube 600 µL
Chilled (2 - 8 degrees Celsius)
If overnight - Chilled (2 - 8 degrees Celsius)
Calcium results must be interpreted in the clinical context. Total calcium is usually reported with a corrected calcium, which more accurately reflects plasma calcium status if the albumin concentration is abnormal. Nonetheless, the best test of calcium status is ionised calcium, collected anaerobically in a blood gas syringe.
Hypercalcaemia and hypocalcaemia both have many different underlying causes. Measurement of PTH with calcium may assist in narrowing down the differential diagnosis.
Common causes of hypercalcaemia include dehydration, hyperparathyroidism and malignancy.
Common causes of hypocalcaemia include hypoparathyroidism, renal failure and hypokalaemia.
|Age||Reference Interval (mmol/L)|
|0d to <1w||1.9 – 2.8|
|1w to <26 w||2.2 – 2.8|
|26w to <18y||2.2 – 2.7|
|18y to Adult||2.2 – 2.6|
Photometric colour test for the quantitative determination of total calcium performed on Beckman Coulter AU5822 analyser using Beckman Coulter reagents
$3.05 (Exclusive of GST)
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