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HelpTest Code UPH24 pH, 24 Hour, Urine
Reporting Name
pH, 24 HR, UPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Assessment of patients with metabolic acidosis, crystalluria, as well as monitoring the effectiveness of alkalinization or acidification of urine for certain medical conditions (eg, treatment of uric acid nephrolithiasis) using a 24-hour collection period
Method Name
pH Meter
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies:
Diazolidinyl Urea (Germall), 5.0 mL (T822)
Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL urine tube or a clean, plastic aliquot container
Specimen Volume: 10 mL
Collection Instructions:
1. Collect urine for 24 hours
2. Add 5 mL of diazolidinyl urea as preservative at start of collection or refrigerate specimen during and after collection.
3. Specimen pH should be between 4.5 and 8 and will stay in this range if kept refrigerated. Specimens with pH >8 indicate bacterial contamination, and testing will be cancelled. Do not attempt to adjust pH as it will adversely affect results.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Specimen Type
UrineSpecimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 7 days | |
| Frozen | 7 days |
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Reference Values
4.5-8.0
Interpretation
Dependent on clinical condition.
A pH greater than 8 suggests the presence of urinary tract infection with a urea-splitting organism.
Day(s) Performed
Monday through Sunday
Report Available
1 to 3 daysTest Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
83986
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| UPH24 | pH, 24 HR, U | 27378-9 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| PH24 | pH, 24 HR, U | 27378-9 |
| TM90 | Collection Duration | 13362-9 |
| VL72 | Volume | 3167-4 |