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HelpTest Code BARBU Barbiturates Confirmation, Random, Urine
Reporting Name
Barbiturates Confirmation, UUseful For
Detecting drug abuse involving barbiturates such as amobarbital, butalbital, pentobarbital, phenobarbital, and secobarbital
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Specimen Type
UrineOrdering Guidance
For situations where chain of custody is required, a Chain-of-Custody Kit (T282) is available. For chain-of-custody testing, order BARBX / Barbiturates Confirmation, Chain of Custody, Random, Urine.
Additional drug panels and specific requests are available. Call 800-533-1710 or 507-266-5700.
Additional Testing Requirements
If urine creatinine is required or adulteration of the sample is suspected, also order ADULT / Adulterants Survey, Random, Urine in addition to this test.
Specimen Required
Supplies: Urine Tubes, 10 mL (T068)
Collection Container/Tube: Plastic urine container
Submission Container/Tube: Plastic, 10-mL urine tube
Specimen Volume: 10 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
Additional Information:
1. No specimen substitutions.
2. STAT requests are not accepted for this test.
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 (Positive results are reported with a quantitative result)
Cutoff concentrations by 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
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
G0480
80345 (if appropriate for select payers)
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| BARBU | Barbiturates Confirmation, U | 53746-4 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 21442 | Butalbital-by GC/MS | 16237-0 |
| 20642 | Amobarbital-by GC/MS | 16239-6 |
| 20643 | Pentobarbital-by GC/MS | 16240-4 |
| 20644 | Secobarbital-by GC/MS | 16238-8 |
| 20645 | Phenobarbital-by GC/MS | 16241-2 |
| 20651 | Barbiturates Interpretation | 69050-3 |
| 20647 | Chain of Custody | 77202-0 |
Report Available
3 to 5 daysReject Due To
| Gross hemolysis | OK |
| Gross icterus | OK |
Method Name
Gas Chromatography Mass Spectrometry (GC-MS)
Secondary ID
80372Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.