UDS - Drug screening cut off levels

UDS

Drug/screening cut off levels ng/ml/length of detection

Etoh/20/12h

Amphetamines/1000/2-3d

Barbs/200/upto 30d

Benzos/200/upto 40d

Marijuana/50/upto 30 - 50 d

Cocaine/300/2-4d

Methadone/300/8-60h

Methaqualone/300/upto 7d

Opiates/300/2-4d

PCP/25/2-3d

Propoxyphene/300/1-3d

TCAs/1000/1-3d

Heroin/2000/1-2h

Screening test will be positive for opiates if poppy seeds are ingested (eg. bagels), if the screening cut-off is 300 ng/mL. Some labs have it at 2000 ng/mL