pH, 24 Hour, Urine
Use
The test is useful for assessing patients with metabolic acidosis, crystalluria, and for monitoring the effectiveness of alkalinization or acidification of urine for certain medical conditions, such as treatment of uric acid nephrolithiasis. It involves a 24-hour collection period to evaluate the pH level of urine and its implications for various metabolic processes.
Special Instructions
24-Hour urine volume is required. Ensure proper collection as per given instructions. Refer to the Urine Preservatives - Collection and Transportation guide for detailed instructions on multiple collections.
Limitations
The urine pH measurement by itself usually provides little diagnostic information unless integrated into the broader clinical context including dietary influences. It can reflect systemic acid-base disorders under certain circumstances. A urine pH greater than 8 indicates possible bacterial contamination with a urea-splitting organism, potentially invalidating the test results.
FDA ApprovedNew York Approved
Methodology
Other (pH Meter)
Biomarkers
LOINC Codes
- 27378-9
- 27378-9
- 13362-9
- 3167-4
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
10 mL
Minimum Volume
1 mL
Container
Plastic, 10-mL urine tube or a clean, plastic aliquot container
Collection Instructions
Collect urine for 24 hours. Add 5 mL of diazolidinyl urea as preservative at start of collection or refrigerate specimen during and after collection. Specimen pH should be between 4.5 and 8. Do not attempt to adjust pH.
Storage Instructions
Refrigerate preferred. Alternatively, can be frozen for stability over 7 days.
Causes for Rejection
Specimen with pH greater than 8 indicative of possible contamination, leading to test cancellation.
Stability Requirements
| Temperature | Period |
|---|---|
| Refrigerated | 7 days |
| Frozen | 7 days |