METHYLMALONIC ACID, URINE

Specimen Required
Collect random urine. Mix well and send 2.0 mL urine (1.5 mL minimum) refrigerated in a screw-capped plastic urine container.

Rejection Criteria
Specimens stored at room temperature, acidified urine.

Methodology
Gas Chromatography/Tandem Mass Spectrometry

Stability
Room Temperature: 4 days; Refrigerated: 12 days; Frozen: 30 days

Reference Range
Result Name   Age   Reference range   Unit of measure  
Methylmalonic Acid, GCMSMS, U    0.3-1.9    mmol/mol creat  
Creatinine, Random urine    0-6 months   0.18-2.86    mmol/L  
Creatinine, Random urine   7-11 months   0.18-3.19    mmol/L  
Creatinine, Random urine   1-2 years   0.18-11.33    mmol/L  
Creatinine, Random urine   3-8 years   0.18-13.19    mmol/L  
Creatinine, Random urine   9-12 years   0.18-16.19    mmol/L  
Creatinine, Random urine   >12 years   2.38-26.55    mmol/L  

Performed
Tuesday, Friday

Turnaround Time7-10 days
Test CodeUMMAG
CPT-4 Code (s)
83921, 82570
LOINC Codes
Creatinine random urine   14683-7  
Methylmalonate/Creatinine   25116-5  

Warde
Medical
Laboratory