Sign in →

Test ID ETGX Ethyl Glucuronide Confirmation, Chain of Custody, Random, Urine

Specimen Required

Supplies: Chain of Custody Kit (T282)

Container/Tube: Chain-of-custody kit containing the specimen containers, seals, and documentation required.

Specimen Volume: 5 mL

Collection Instructions: Collect specimen in the provided container, seal, and submit with the associated documentation to satisfy the legal requirements for chain-of-custody testing.

Additional Information: Submitting <5 mL will compromise our ability to perform all necessary testing.


If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.

Useful For

Monitoring abstinence in clinical and justice system settings using ethyl glucuronide and ethyl sulfate as direct biomarkers or metabolites of ethanol


This chain-of-custody test is intended to be used in a setting where the test results can be used definitively to make a diagnosis.


Chain of custody is required whenever the results of testing could be used in a court of law. Its purpose is to protect the rights of the individual contributing the specimen by demonstrating that it was under the control of personnel involved with testing the specimen at all times; this control implies that the opportunity for specimen tampering would be limited.

Additional Tests

Test ID Reporting Name Available Separately Always Performed
COCH Chain of Custody Processing No Yes
ADLTX Adulterants Survey, CoC, U Yes Yes

Testing Algorithm

Adulterants testing will be performed on all chain-of-custody urine samples as per regulatory requirements.

Method Name

ETGX: Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)

ADLTX: Spectrophotometry (SP)

Reporting Name

Ethyl Glucuronide Conf, CoC, U

Specimen Type


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Urine Refrigerated (preferred) 28 days
  Frozen  28 days
  Ambient  72 hours

Reference Values


Cutoff concentrations: 500 ng/mL

Day(s) Performed

Tuesday, Thursday, Sunday

Report Available

3 to 5 days

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test 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 US Food and Drug Administration.

CPT Code Information



G0480 (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
ETGX Ethyl Glucuronide Conf, CoC, U 93705-2


Result ID Test Result Name Result LOINC Value
36853 ETG Immunoassay Screen 93706-0
63418 Ethyl Glucuronide 58378-1
36850 Ethyl Sulfate 58425-0
36852 Chain of Custody 77202-0
36851 Ethyl Gluc/Sulfate Interpretation 59462-2