Calcium; urine

Alternative names:

urinary Ca+2

Normal values:

• normal diet: 100 to 300 mg/day (2.5-7.5 mmol/day)
• low-calcium diet: 50 to 150 mg/day

Note: mg/day = milligrams per day; mmol/day = millimoles per day

What abnormal results mean:

Increased levels of urine calcium may indicate:

• Cushing's syndrome
• idiopathic hypercalcinuria
• milk-alkali syndrome
• osteolytic bone disease
• osteoporosis
• primary hyperparathyroidism
• renal tubular acidosis
• sarcoidosis
• vitamin D intoxication

Decreased levels of urine calcium may indicate:

• hypoparathyroidism
• malabsorption (inadequate absorption of nutrients from the intestinal tract) disorders
• renal osteodystrophy
• vitamin D deficiency

Additional conditions under which the test may be performed:

• secondary hyperparathyroidism