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HelpTest Code AMMO Ammonium, 24 Hour, Urine
Reporting Name
Ammonium, 24 Hr, UPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Diagnosis of the cause of acidosis
Diagnosis and treatment of kidney stones
Method Name
Enzymatic
Necessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies:
-Sarstedt 5 mL Aliquot Tube (T914)
-Diazolidinyl Urea (Germall) 5.0 mL (T822)
Container/Tube: Plastic vial
Specimen Volume: 4 mL
Collection Instructions:
1. Add 5 mL of diazolidinyl urea (Germall) as preservative at start of collection or refrigerate specimen during and after collection.
2. Collect urine for 24 hours.
3. Aliquot urine into plastic vial.
4. Specimens with pH >8 may 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) | 14 days | |
| Frozen | 14 days | ||
| Ambient | 72 hours |
Reject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Reference Values
15-56 mmol/24 hour
Reference values have not been established for patients <18 years and >77 years of age.
Reference values apply to 24 hour collections.
Interpretation
If a patient has acidosis and the amount of ammonium in the urine is low, this is suggestive of a renal tubular acidosis.
If the amount of ammonium is high, this suggests that the kidneys are working normally and that there are other losses of bicarbonate in the body. Typically this implies gastrointestinal losses.
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 to 2 daysTest Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82140
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| AMMO | Ammonium, 24 Hr, U | 25308-8 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| AM24 | Ammonium, 24 Hr, U | 25308-8 |
| TM25 | Collection Duration | 13362-9 |
| VL91 | Urine Volume | 3167-4 |
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.