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Calcium blood test
Normal Reference Range
Calcium/ Corrected Calcium: 2.2 – 2.6mmol/L
Test Information
Numerous disorders affecting the bones, heart, nerves, and kidneys are correlated with calcium levels. The majority of the body's calcium is related with bones, and circulating levels show bone health and turnover. Additionally, as a result of PTH production, the parathyroid gland mediates an increase in serum calcium. Adenoma, carcinoma, or hyperplastic syndromes cause high serum calcium as a result of bone mineralization and enhanced renal reabsorption and intestinal uptake in primary hyperparathyroidism. Renal failure is frequently reflected in secondary manifestations. Clinical care should be based on a calcium result that has been rectified. A computation based on albumin levels that does not apply to very low albumin levels (20 g/L) yields the corrected calcium result. Please measure the ionised calcium from a blood gas analyser in these situations.
Clinical Indications
• Primary hyperparathyroidism is often characterised by increased calcium and decreased phosphate, while secondary variants are characterised by elevated phosphate.
• Hypoparathyroidism, hypomagnesaemia, Ricketts, and vitamin D insufficiency are all linked to decreased serum calcium levels.
• Diagnosis and evaluation of individuals with recurrent urolithiasis as well as monitoring the efficacy of thiazide medication to reduce calciuria in known stone producers.
• Patients with hyperthyroidism may develop hypercalcaemia as a result of increased bone turnover.
• Osteolytic bone lesions in patients with multiple myeloma can cause hypercalcemia.
• Patients with hypervitaminosis D may experience severe hypercalcaemia, which calls for the prompt cessation of vitamin D and adequate therapeutic therapy. This is particularly important for elderly patients who have used vitamin supplements excessively or for individuals with mental illnesses.
Sample Required
5mL serum sample blood tube is required for Calcium blood test
Min. sample volume
0.5mL
Special Instructions and Precautions
Not applicable
Time Limits For Retrospective Testing
5 days
Any factors affecting the test
Not applicable
Turnaround Time
4 hours
Referral centre (if applicable)
Not applicable
Test Code
CAL or BONE