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Test Code RAMBO Ammonium, Random, Urine

Useful For

Diagnosis of the cause of acidosis using random urine specimens

 

Diagnosis and treatment of kidney stones

Method Name

Enzymatic

Reporting Name

Ammonium, Random, U

Specimen Type

Urine


Specimen Required


Supplies: Sarstedt 5 mL Aliquot Tube (T914)

Container/Tube: Plastic tube

Specimen Volume: 4 mL

Collection Instructions:

1. Collect a random urine specimen.

2. No preservative.


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

Reference Values

Random: 3-65 mmol/L

No reference values established for <18 years and >77 years of age.

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.

Clinical Reference

1. Peonides A, Levin B, Young W: The renal excretion of hydrogen ions in infants and children. Arch Dis Child. 1965 Feb;40(209):33-39

2. Kamel KS, Briceno LF, Sanchez MI, et al: A new classification for renal defects in net acid excretion. Am J Kidney Dis. 1997 Jan;29(1):136-146

3. Madison LL, Seldin DW: Ammonia excretion and renal enzymatic adaptation in human subjects, as disclosed by administration of precursor amino acids. J Clin Invest 1958. Nov;37(11):1615-1627

4. Coe FL, Evan A, Worcester E: Pathophysiology-Based Treatment of Idiopathic Calcium Kidney Stones. Clin J Am Soc Nephrol. 2011 Aug;6(8):2083-2092

Day(s) Performed

Monday through Sunday

Report Available

Same day to 2 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

82140

LOINC Code Information

Test ID Test Order Name Order LOINC Value
RAMBO Ammonium, Random, U 1842-4

 

Result ID Test Result Name Result LOINC Value
RAMBO Ammonium, Random, U 1842-4

Test 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.

Forms

If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.