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Calcium (urine)
Elevated in hyperparathyroidism, bone resorption
Also known as: Urine Ca,UCa
Reference Ranges
Clinical Reference
50.0 – 300.0 mg/24hr
Optimal Range
100.0 – 250.0 mg/24hr
Varies with intake; >300 = hypercalciuria
Related Conditions
Hyperparathyroidism
High
Osteoporosis
High
Kidney Stones
High
Food & Lifestyle Recommendations
🍎 Food
Stay well-hydrated — aim for 2-3 liters of water daily to prevent kidney stones
High fluid intake dilutes urine calcium and reduces stone formation risk by 50%
🍎 Food
Reduce sodium — sodium and calcium are excreted together in urine
Every 100mmol sodium increase raises urine calcium by ~25mg/day
🍎 Food
Don't reduce dietary calcium — paradoxically, normal calcium intake reduces urine calcium by binding oxalate
Low dietary calcium increases oxalate absorption and stone risk; normal intake is protective
Evidence-Backed Supplements
When High
-
Moderate evidence; magnesium competes with calcium for renal reabsorption. Supplementation may reduce hypercalciuria.
Magnesium glycinate 200–300 mg elemental Mg/day Evening -
Limited evidence; vitamin K keeps calcium in bones rather than soft tissue. May reduce urinary calcium loss.
-
Moderate evidence; potassium citrate reduces urinary calcium excretion and prevents calcium stones.
Questions to Ask Your Doctor
- Does my high urine calcium mean I'm at risk for kidney stones or bone loss? Hypercalciuria is the most common cause of calcium kidney stones; also risk factor for osteoporosis.
Upload your blood test to see how your Calcium (urine) compares to reference and optimal ranges.
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