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HelpTest Code 24CT Citrate, Urine
Specimen Requirements
Specimen Type: 24 hours urine collection with 6N HCL OR 3 g Thymol
Container/Tube: 24 hours urine container containing 6N HCL OR 3 g Thymol
Minimum volume: 20 mL urine
Collection Instructions: Urine must be acidified with 6N HCL OR 3 g Thymol during collection. Keep refrigerated during collection
Please refer to NUH's Urine Preservative Guide
Sample Stability
** Preferred temperatures for storage prior to and during shipping to NUH **
| Specimen Type: | 24hr urine |
|---|---|
| Ambient: | Unacceptable |
| Refrigerate: | 4 days |
| Frozen: | 2 weeks |
Reference Interval
|
Age |
Male |
Female |
|
2 to <7 years |
177 - 591 mg/day/1.73m2 |
218 - 651 mg/day/1.73m2 |
|
7 to <13 years |
162 - 600 mg/day/1.73m2 |
253 - 657 mg/day/1.73m2 |
|
13 to <18 years |
130 - 476 mg/day/1.73m2 |
248 - 729 mg/day/1.73m2 |
|
≥18 years |
320 - 1240 mg/day |
|
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
Enzymatic Colorimetric Assay
Service Code
31152
Update
Last updated 05/09/2024
Updated on Sample Stability Ambient
Unacceptable Condition
| Haemolysis | NA |
|---|---|
| Icterus | NA |
| Lipaemic | NA |
| Others | Urine not preserved with 6N HCL OR 3 g Thymol during collection |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Investigation of renal calculi