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HelpTest Code LAB0214031 Barbiturates Confirmation, Random, Urine
Additional Codes
| Mayo Test ID |
|---|
| BARBU |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Detecting drug abuse involving barbiturates such as amobarbital, butalbital, pentobarbital, phenobarbital, and secobarbital
Method Name
Gas Chromatography Mass Spectrometry (GC-MS)
Reporting Name
Barbiturates Confirmation, USpecimen 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)
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 | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 14 days | |
| Frozen | 14 days | ||
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | OK |
| Gross icterus | OK |
Reference Values
Negative
Cutoff concentrations:
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
Interpretation
The presence of a barbiturate in urine indicates use of one of these drugs.
Most of the barbiturates are fast acting; their presence indicates use within the past 3 days.
Phenobarbital, commonly used to control epilepsy, has a very long half-life. The presence of phenobarbital in urine indicates that the patient has used the drug sometime within the past 30 days.
Day(s) Performed
Monday, Wednesday, Friday
Report Available
3 to 5 daysSpecimen Retention Time
14 daysTest 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
80345
G0480 (if appropriate)
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 |
Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.