DRUG ABUSE SCREEN, SERUM

Test Documentation
Components
Although urine is the specimen of choice for drug screening, a serum drug screen can be performed when a urine specimen is unavailable (autopsy, dialysis patient).

Specimen Required
Draw blood in a plain red-top tube. Centrifuge, separate and send 1.0 mL serum (0.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Plasma: EDTA, citrate and oxalate

Rejection Criteria
SST, gross hemolysis, lipemia

Methodology
Immunoassay

Stability
Room Temperature: 48 hours; Refrigerated: 14 days; Frozen: 14 days

Reference Range
Decision Levels:
Drugs Included   Screen Cutoff Concentration   
Amphetamines   500 ng/mL   
Barbiturates   150 ng/mL   
Benzodiazepines   100 ng/mL   
Cocaine   150 ng/mL   
Ethanol   10 mg/dL*   
Methadone   150 ng/mL   
Opiates   150 ng/mL   
Phencyclidine   12 ng/mL   
Propoxyphene   150 ng/mL   
THC (Cannabis)   50 ng/mL   
*Quantitative value reported.

Performed
Monday-Friday

Turnaround Time3 days
Test CodeSDS1A
CPT-4 Code (s)
80307
LOINC Codes
Amphetamines   3348-0  
Barbiturates   20421-4  
Benzodiazepines   3389-4  
Cocaine   3395-1  
Ethanol   5643-2  
Methadone   59705-4  
Opiates   8219-8  
Phencyclidine   8236-2  
Propoxyphene   3542-8   
THC (Cannabis)   3425-6  

Warde
Medical
Laboratory