Citrate Excretion, Urine, Citrate
11 days
Nuclear magnetic resonance (NMR) or Enzymatic
Accredited Laboratory Partner
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Measures urinary citrate excretion over 24 hours. Helps evaluate kidney stone risk.
24 hour urine acidified
2 mL aliquot
Plastic 24-hour urine container with 30 mL 6N HCl 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.
Record entire 24-hour total volume on the request form. pH must be 1 to 3 or the sample FROZEN without the addition of acid.
| Temperature | Period |
|---|---|
| Room temperature | 29 days |
| Refrigerated | 29 days |
| Frozen | 49 days |
| Freeze/thaw cycles | stable x5 |