Calcium/Creatinine Ratio, spot-urine Ca/Cr Ratio
Up to 24 hours
Colorimetric (NM-BAPTA) Enzymatic (Creatinine)
Accredited NRL Laboratory
Daily
A random (spot) urine calcium-to-creatinine ratio helps assess kidney stone risk (hypercalciuria), evaluate calcium metabolism disorders, and aid in differential diagnoses for abnormal serum calcium levels, e.g. hyperparathyroidism.
Results are reported in SI units (mmol)
Urine
4 mL
Sterile 50 mL urine container (No preservative)
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
Ensure the sample is received at NRL within 24 hours of collection. If this is not possible, samples should be stored and transported frozen (-20°C)
| Temperature | Period |
|---|---|
| Refrigerated | 4 days at 2-8°C |
| Frozen | 21 days at -20°C |