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HelpTest Code 0289827 Acylglycines, Quantitative, Urine
Additional Codes
| Mayo Test ID |
|---|
| ACYLG |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Biochemical screening of asymptomatic patients affected with 1 of the following inborn errors of metabolism:
-Short chain acyl-CoA dehydrogenase (SCAD) deficiency
-Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency
-Medium-chain 3-ketoacyl-CoA thiolase (MCKAT) deficiency
-Glutaric acidemia type II
-Ethylmalonic encephalopathy
-2-Methylbutyryl-CoA dehydrogenase deficiency
-Isovaleryl-CoA dehydrogenase deficiency
-Glutaryl-CoA dehydrogenase deficiency
Testing Algorithm
The following algorithms are available in Special Instructions:
-Newborn Screening Follow-up for Elevations of C8, C6, and C10 Acylcarnitines (also applies to any plasma or serum C8, C6, and C10 acylcarnitine elevations)
-Newborn Screening Follow-up for Isolated C4 Acylcarnitine Elevations (also applies to any plasma or serum C4 acylcarnitine elevation)
-Newborn Screening Follow-up for Isolated C5 Acylcarnitine Elevations (also applies to any plasma or serum C5 acylcarnitine elevation)
Special Instructions
- Newborn Screening Follow-up for Isolated C4 Acylcarnitine Elevations (also applies to any plasma or serum C4 acylcarnitine elevations)
- Newborn Screening Follow-up for Elevations of C8, C6, and C10 Acylcarnitine Elevations (also applies to any plasma or serum C8, C6, and C10 acylcarnitine elevations)
- Newborn Screening Follow-up for Isolated C5 Acylcarnitines Elevations (also applies to any plasma or serum C5 acylcarnitine elevations)
Method Name
Gas Chromatography-Mass Spectrometry (GC-MS) Stable Isotope Dilution Analysis
Reporting Name
Acylglycines, QN, USpecimen Type
UrineAdvisory Information
Diagnostic specificity of inborn errors of metabolism via urine acylglycine testing is useful only for the selected inborn errors of metabolism; it is recommended that urine organic acids (OAU / Organic Acids Screen, Urine) be ordered and run simultaneously due to the limited number of metabolites included in this urine acylglycine test.
Necessary Information
1. Patient's age is required.
2. Include family history, clinical condition (asymptomatic or acute episode), diet, and drug therapy information.
Specimen Required
Supplies: Urine Tubes, 10 mL (T068)
Container/Tube: Plastic, 10-mL urine tube (T068)
Specimen Volume: 10 mL
Pediatric: If insufficient collection volume, submit as much specimen as possible in a single container; the laboratory will determine if volume is sufficient for testing.
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Specimen Minimum Volume
4 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Frozen (preferred) | 416 days |
| Refrigerated | 9 days |
Reject Due To
|
Hemolysis |
NA |
|
Lipemia |
NA |
|
Icterus |
NA |
|
Other |
NA |
Reference Values
|
Control Values Results Expressed as mg/g Creatinine |
|
|
|
Range |
|
Ethylmalonic Acid |
0.5-20.2 |
|
2-Methylsuccinic Acid |
0.4-13.8 |
|
Glutaric Acid |
0.6-15.2 |
|
Isobutyrylglycine |
0.00-11.0 |
|
n-Butyrylglycine |
0.1-2.1 |
|
2-Methylbutyrylglycine |
0.3-7.5 |
|
Isovalerylglycine |
0.3-14.3 |
|
n-Hexanoylglycine |
0.2-1.9 |
|
n-Octanoylglycine |
0.1-2.1 |
|
3-Phenylpropionylglycine |
0.00-1.1 |
|
Suberylglycine |
0.00-11.0 |
|
trans-Cinnamoylglycine |
0.2-14.7 |
|
Dodecanedioic Acid (12 DCA) |
0.00-1.1 |
|
Tetradecanedioic Acid (14 DCA) |
0.00-1.0 |
|
Hexadecanedioic Acid (16 DCA) |
0.00-1.0 |
Interpretation
When abnormal results are detected, a detailed interpretation is given including an overview of the results and of their significance; a correlation to available clinical information; elements of differential diagnosis; recommendations for additional biochemical testing and in vitro confirmatory studies (enzyme assay, molecular analysis); name and phone number of key contacts who may provide these studies at Mayo Clinic or elsewhere; and a phone number to reach one of the laboratory directors in case the referring physician has additional questions.
Day(s) and Time(s) Performed
Monday, Wednesday, Friday; 8 a.m.
Analytic Time
5 days (not reported on Saturday or Sunday)Specimen Retention Time
3 monthsTest Classification
This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.CPT Code Information
82542
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ACYLG | Acylglycines, QN, U | 50334-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 21011 | Ethylmalonic Acid | 13741-4 |
| 21012 | 2-Methylsuccinic acid | 13777-8 |
| 21013 | Glutaric acid | 13748-9 |
| 21014 | Isobutyrylglycine | 38360-4 |
| 23387 | n-Butyrylglycine | 27892-9 |
| 21015 | 2-Methylbutyrylglycine | 27097-5 |
| 21016 | Isovalerylglycine | 13766-1 |
| 23388 | n-Hexanoylglycine | 13753-9 |
| 21017 | n-Octanoylglycine | 38367-9 |
| 23389 | 3-Phenylpropionylglycine | 13793-5 |
| 23390 | Suberylglycine | 13811-5 |
| 21018 | trans-Cinnamoylglycine | 38417-2 |
| 21019 | Dodecanedioic acid | 13732-3 |
| 21020 | Tetradecanedioic acid | 50333-4 |
| 21021 | Hexadecanedioic acid | 50332-6 |
| 23414 | Interpretation | 59462-2 |
| 23416 | Reviewed By | 18771-6 |
Forms
If not ordering electronically, complete, print, and send an Inborn Errors of Metabolism Test Request (T798) with the specimen.