Calcium, 24-Hour Urine


See Also Calcium, Ionised, Serum


Increased urinary calcium levels occur in hyperparathyroidism, osteoporosis, Paget’s disease, hepatocellular degeneration, Fanconi’s syndrome, schistosomiasis, vitamin D intoxication, Cushing’s disease,thyrotoxicosis, sarcoidosis, osteolytic bone metastasis, myeloma, and malignant neoplasms.Decreased in hypoparathyroidism, pseudo-hypoparathyroidism, rickets, osteomalacia, all cases of hypocalcaemia apart from renal disease, many cases of nephrosis, acute nephritis, osteoblastic metastasis, hypothyroidism, celiac sprue disease, and steatorrhea.

Sample Type, Quantity & Conditions

5 ml of 24 Hrs Urine Stability: 2 Days at 15-25 °C 4 Days at 2-8 °C 3 Weeks at (-15)-(-25) °C

Special Precautions

Urine should be collected in acid-washed bottles containing 20-30 mL of 6 mol/L HCL to prevent calcium salt precipitation. Paediatric specimens may be submitted without preservative. Diet may influence result. State 24 Hrs urine volume.

Normal Range

100 - 300 mg/24 Hrs 2.5 - 7.5 mmol/24 Hrs

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