24 Hrs Urinary Calcium
Report in 24Hrs
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Quantifies calcium in urine over 24 hours; useful in evaluating hyperparathyroidism and kidney stone risk.
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🧪 24-Hour Urinary Calcium Test
Aspect | Details |
|---|---|
Fasting Required? | ✅ Preferable, especially for dietary control (8–10 hours) |
Sample Required | Full 24-hour urine collection in a special container |
Main Organs Involved | Kidneys, bones, parathyroid glands |
Purpose | Measures the total amount of calcium excreted in urine over 24 hours |
🔍 Why Is It Done?
Clinical Use | What It Evaluates |
|---|---|
🦴 Hypercalcemia evaluation | Helps determine if high blood calcium is due to increased loss in urine |
💎 Kidney stone risk (calcium stones) | Assesses risk for calcium oxalate or calcium phosphate stones |
🦠 Parathyroid disorders | Helps diagnose hyperparathyroidism |
🧬 Inherited calcium metabolism issues | Such as familial hypocalciuric hypercalcemia (FHH) or MEN syndromes |
💊 Monitoring calcium supplement use | Especially in patients with osteoporosis or postmenopausal women |
📈 Normal Reference Range
- Adults:
- Men: 100–300 mg/day
- Women: 100–250 mg/day
- Values vary based on diet and fluid intake
📊 Interpreting Results
Result | Possible Interpretation |
|---|---|
🔼 High Urinary Calcium | Hyperparathyroidism, excess vitamin D or calcium intake, sarcoidosis, Paget’s disease, kidney stone risk |
🔽 Low Urinary Calcium | Hypoparathyroidism, vitamin D deficiency, chronic kidney disease, malabsorption syndromes |
🍽️ Dietary Influence
- High salt and protein intake → ↑ urinary calcium
- Low magnesium → may reduce calcium excretion
- Dairy and calcium-rich meals before test → may elevate values
📌 A calcium-restricted diet may be advised for 1–2 days prior to testing if medically appropriate.
🧪 Recommended Complementary Tests
If Urinary Calcium Is Abnormal | Recommended Tests |
|---|---|
Blood Calcium (Total & Ionized) | To assess serum levels in parallel |
Serum PTH (Parathyroid Hormone) | To identify parathyroid-related causes |
Vitamin D 25OH | Deficiency or toxicity can affect calcium levels |
24h Urinary Creatinine | To verify completeness of urine collection |
Renal Function Tests (eGFR, Creatinine) | Assess filtration status in kidney-related calcium issues |
Urine Oxalate, Citrate, Phosphorus | If evaluating kidney stone risk |
Imaging (Ultrasound KUB, CT) | For suspected kidney stones |
✅ Summary Table
Test | Purpose | Normal Range | Sample Type |
|---|---|---|---|
24-Hour Urinary Calcium | Evaluate calcium loss, stone risk, bone health | 100–300 mg/day (Men), 100–250 mg/day (Women) | 24-hour urine |
📌 Key Notes:
- The 24h urine calcium is often higher in hyperparathyroidism and calcium stone formers.
- Low urinary calcium with high serum calcium may suggest FHH (familial hypocalciuric hypercalcemia).
How our test process works!
