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Test Mnemonic BARBX Barbiturates Confirmation, Chain of Custody, Urine

Useful For

Detecting drug abuse involving barbiturates such as amobarbital, butalbital, pentobarbital, phenobarbital, and secobarbital

 

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.

Reporting Name

Barbiturates Confirmation, CoC, U

Specimen Type

Urine


Specimen Required


Container/Tube: Chain-of-Custody Kit (T282) containing the specimen containers, seals, and documentation required.

Specimen Volume: 20 mL

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

Additional Information: Submitting <20 mL will compromise our ability to perform all necessary testing.


Specimen Minimum Volume

5 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  14 days
  Ambient  72 hours

Reference Values

Negative

Cutoff concentrations:

 

IMMUNOASSAY SCREEN

<200 ng/mL

 

BUTALBITAL BY GC-MS

<100 ng/mL

 

AMOBARBITAL BY GC-MS

<100 ng/mL

 

PENTOBARBITAL BY GC-MS

<100 ng/mL

 

SECOBARBITAL BY GC-MS

<100 ng/mL

 

PHENOBARBITAL BY GC-MS

<100 ng/mL

Day(s) and Time(s) Performed

Monday through Friday

Performing Laboratory

Mayo Medical 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 U.S. Food and Drug Administration.

CPT Code Information

80345

G0480 (if appropriate)

LOINC Code Information

Test ID Test Order Name Order LOINC Value
BARBX Barbiturates Confirmation, CoC, U In Process

 

Result ID Test Result Name Result LOINC Value
6668 Barbiturates Immunoassay Screen 19270-8
36143 Butalbital-by GC/MS 16237-0
36144 Amobarbital-by GC/MS 16239-6
36145 Pentobarbital-by GC/MS 16240-4
36146 Secobarbital-by GC/MS 16238-8
36147 Phenobarbital-by GC/MS 16241-2
36148 Barbiturates Interpretation 69050-3
36149 Chain of Custody No LOINC Needed

Method Name

Immunoassay/Gas Chromatography-Mass Spectrometry (GC-MS) Confirmation with Quantitation