Extractions and GC/MS Confirmation
How a Sample Moves Through the Laboratory
- The accessioner opens each sample received on a one for one basis. The accessioner checks the sample to ensure that seal is intact along with proper Chain of Custody. A unique identifier called the Laboratory Accessioning Number (LAN) is then placed on the sample and the Chain of Custody.
- Hair samples are then weighted and transferred to a tube identified by the LAN # on a one for one basis.
- After this, the specimens are transferred )with a signed Chain of Custody document) to a screening chemist who performs the screening test batches each with a set of calibrators, negatives and controls for each drug assayed. Each of these controls must be acceptable before the negatives are sent for final evaluation and release; the batches are then verified (again with a signed Chain of Custody document) and removed from the instruments by a second screening chemist.
- Any presumptive positive specimen is then placed on a computer list for the accessioning department to go back and remove another completely new portion of the sample from the specimen.
- After this, the specimens are transferred (with a signed Chain of Custody document) to a GC/MS chemist.
- After extraction, these samples along with calibrators, negatives and controls are then places on the instrument by the GC/MS chemist for analysis (again with a signed Chain of Custody document). After analysis, the samples are again verified (again with a signed Chain of Custody document) when they are removed from the instrument by a second GC/MS chemists.
- Each analysis run is extensively critiqued, negatives must be negatives, positives must be positives, the correct ions must be present in the correct ratios and control results must be within ± 20% of the correct (pre-determined) value. These items among a host of others are what must be correct before a specimen can be considered positive. Any deviation from these “rules” will result in a report being considered negative.
The Noble Diagnostics
Five-Panel Hair Test Includes:
Chain of Custody forms
Noble Diagnostics toll-free number
Reports via secure FAX, Web, or Data transfer
The fasted turnaround time in the industry (94% + of results are reported day of receipt)
CD ROM or online training and certification of collectors
Local collections available in your area for an additional charge
It takes approximately 5-7 days from the time of drug use for the portion of the hair containing that drug to grow above the scalp.
Yes: if, for any reason, a person’s head hair can’t be tested, the second option is body hair from the underarm, chest or back.