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HelpTest Code BARBX Barbiturates Confirmation, Chain of Custody, Random, Urine
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.
Specimen Type
UrineSpecimen Required
Supplies: Chain of Custody Kit (T282)
Container/Tube: Chain of custody kit (T282) containing the specimen containers, seals, and documentation required
Specimen Volume: 10 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 less than 10 mL will compromise the 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 |
Reject Due To
| Gross hemolysis | OK |
| Gross icterus | OK |
Clinical Information
Barbiturates represent a class of drugs that were originally introduced as sleep inducers. Butalbital is also used to control severe headaches. Mephobarbital and phenobarbital are frequently used to control major motor (grand mal) seizures. These drugs are commonly abused as "downers" to induce sleep after an amphetamine- or cocaine-induced "high."
Chain of custody is a record of the disposition of a specimen to document the personnel who collected, handled, and performed the analysis. When a specimen is submitted in this manner, analysis will be performed in such a way that it will withstand regular court scrutiny.
Reference Values
Negative
Positive results are reported with a quantitative result.
Cutoff concentrations:
Immunoassay screen: 200 ng/mL
Gas chromatography mass spectrometry:
Butalbital: 100 ng/mL
Amobarbital: 100 ng/mL
Pentobarbital: 100 ng/mL
Secobarbital: 100 ng/mL
Phenobarbital: 100 ng/mL
Day(s) Performed
Monday, Wednesday, Friday
Report Available
3 to 5 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80345
G0480 (if appropriate)
Method Name
Immunoassay/Gas Chromatography Mass Spectrometry (GC-MS) Confirmation with Quantitation
Forms
1. Chain of Custody Request is included in the Chain of Custody Kit (T282).
2. If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.