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HelpTest Code LAB1939 Aminolevulinic Acid, Urine
Additional Codes
U ALA
Reporting Name
Aminolevulinic Acid, USCH Clinical System Name: Aminolevulinic Acid (ALA), Urine
Useful For
Assisting in the differential diagnosis of the acute hepatic porphyrias
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineOrdering Guidance
The preferred test for lead toxicity in children is blood lead; order either PBDV / Lead, Venous, with Demographics, Blood or PBDC / Lead, Capillary, with Demographics, Blood.
Necessary Information
Patient's age is required.
Specimen Required
Patient Preparation: Patient should not consume any alcohol for 24 hours before specimen collection.
Supplies: Urine Tubes, 10 mL (T068)
Collection Container/Tube: Clean, plastic urine collection container
Submission Container/Tube: Plastic vial
Specimen Volume: 2 mL
Collection Instructions: Collect a random urine specimen.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 28 days | |
| Frozen | 45 days |
Special Instructions
Reference Values
<1 year: ≤10 nmol/mL
1-17 years: ≤20 nmol/mL
≥18 years: ≤15 nmol/mL
Day(s) Performed
Tuesday, Thursday
TAT: 5 - 8 days
Test Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
82135
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ALAUR | Aminolevulinic Acid, U | 34284-0 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 61547 | Aminolevulinic Acid, U | 34284-0 |
| 34347 | Interpretation (ALA), U | 59462-2 |
| 34348 | Reviewed By | 18771-6 |
Method Description
Aminolevulinic acid (ALA) is determined by liquid chromatography tandem mass spectrometry (LC-MS/MS) stable isotope dilution analysis. The urine is mixed with an internal standard ([13]C5, [15]N ALA-IS) and filtered using a 0.2 mcM nylon filter vial. The ratios of the extracted peak areas of ALA to ALA-IS determined by LC-MS/MS are used to calculate the concentration of ALA present in the sample.(Lacey, JM, Magera MJ, Tortorelli S: Delta aminolevulinic acid quantitation in urine by LC-MS/MS. J Am Soc Mass Spectrom. 2011;22, S1:pp 69)
Report Available
3 to 7 daysReject Due To
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.Method Name
Liquid Chromatography Tandem Mass Spectrometry (LC-MS/MS)
Forms
If not ordering electronically, complete, print, and send a Biochemical Genetics Test Request (T798) with the specimen.
Aliases: 5-Aminolevulinic Acid; Acute Intermittent Porphyria (AIP); ALA Dehydratase Deficiency; Porphyria (ADP); Delta-Aminolevulinic Acid; Hereditary Coproporphyria (HCP); Variegate Porphyria (VP)