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HelpTest Code CTCR Citrate : Creatinine Ratio (NUHS)
Specimen Requirements
Specimen Type: Random urine
Container/Tube: Screw Capped sterile urine container.
Minimum Volume: 20 mL urine
Collection Instructions: Collect mid-stream urine in preservative-free urine container. Unacidified Urine.
Sample Stability
** Preferred temperatures for storage prior to and during shipping to NUH **
| Specimen Type | Urine |
|---|---|
| Ambient | Unacceptable |
| Refrigerate | 4 days |
| Frozen | 2 weeks |
Reference Interval
| Age | Male | Female |
|---|---|---|
| 2 to <7years | 27 - 86 mg/mmol | 33 - 98 mg/mmol |
| 7 to <13years | 16 - 62 mg/mmol | 30 - 78 mg/mmol |
| 13 to <18years | 10 - 38 mg/mmol | 24 - 69 mg/mmol |
Reference ranges provided are based on 5th to 50th percentile. Patients at risk of nephrolithiasis should ideally have urine citrate excretion ≥ 50th percentile.
Days and Times Performed
Tuesday, TAT 2-8 days
Methodology
Citrate: Enzymatic Colorimetric Assay
Creatinine:Enzymatic
Service Code
0031152
Update
Last update 05/09/2024
Updated on Sample Stability Ambient
Unacceptable Condition
| Haemolysis | NA |
|---|---|
| Icterus | NA |
| Lipaemia | NA |
| Others | NA |
Useful For
Investigation of renal calculi