Main Content

Gas Chromatography/Mass Spectroscopy (GC/MS)

Test Name:Gas Chromatography/Mass Spectroscopy (GC/MS)
Epic Order Code:LAB678
CPT Code:82541  
Specimen(s) Type:Serum or Plasma, 3 mL;  Urine, 5 mL;  Gastric Contents,
5 mL
Acceptable Container(s):Serum/Plasma: Tops are red and purple (lavender).
 Urine/Gastric: Sterile container
Testing Schedule:Monday-Friday, 7:30 a.m.-4 p.m. After-hours, emergency basis only.
Turn Around Time:STAT: 1 hour
 Routine: 3 hours
Collection Information:No special patient preparation is required. Obtain specimen by standard collection procedures. Do not collect in serum separator tubes.
Transport Information:Deliver to lab immediately. All specimens must be signed into the laboratory.
Reference Clients:If unable to deliver to the lab within 1 hour, store and transport at 2-8° C. Specimen is stable as long as it remains tightly capped.
Causes for Rejection:Improperly labeled, incorrect container, contaminated, insufficient quantity, incorrect transport.
Reference Range:NA
Additional Information:GC/MS is normally used in conjunction with immunoassay drugs of abuse screens for the detection of both drugs of abuse and therapeutics. We maintain a database of approximately 2,200 drugs and their metabolites for detection and identification.