Order Code AMMO Ammonium, 24 Hour, Urine
Useful For
Diagnosis of the cause of acidosis
Diagnosis and treatment of kidney stones
Special Instructions
Method Name
Enzymatic
Reporting Name
Ammonium, 24 Hr, USpecimen Type
UrineNecessary 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 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.
Method Description
Urine samples are diluted 1:100 with clinical laboratory reagent water using a liquid handler and then are analyzed on a Roche cobas.(Package insert: Roche NH3L kit. Roche Diagnostics; V10/2016)
Day(s) Performed
Monday through Sunday
Performing Laboratory
Mayo Clinic Laboratories in RochesterCPT Code Information
82140
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.