Use to determine the cause of acidosis. May aid in diagnosing and monitoring kidney stones. A 24-hour urine collection of ≥500 mL is required. To submit a random urine or 24-hour collection with a total volume of <500 mL, contact ARUP Client Services for further assistance.
Quantitative Enzymatic Assay
New York DOH Approval Status
24-hour urine. Refrigerate during collection or add 5 mL of diazolidinyl urea (Germall) as preservative at start of collection.
From a well-mixed 24-hour collection, transfer 4 mL urine to an ARUP Standard Transport Tube. (Min: 1 mL). Collection duration and urine volume must be provided for testing.Test is not performed at ARUP; separate specimens must be submitted when multiple tests are ordered.
Refrigerated. Also acceptable: Frozen.
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. Collection duration and urine volume must be provided for testing. Total collection volume must be greater than 500 mL.
Ambient: 72 hours; Refrigerated: 2 weeks; Frozen: 2 weeks
Performed by non-ARUP Laboratory
Reference values have not been established for patients less than 18 years and greater than 77 years of age. The presence of sulfasalazine, sulfapyridine, or temozolomide may lead to false results.
|Component Test Code*||Component Chart Name||LOINC|
|3004263||Ammonium, 24 Hour Urine||25308-8|
|3004264||Ammonium Collection Duration||13362-9|
|3004265||Ammonium Urine Volume||3167-4|
Mayo Clinic Laboratories