EtG is a direct metabolite of ethyl alcohol and is a marker for recent alcohol exposure. EtG is nonvolatile, water soluble and stable. It may be detectable as soon as 2 hours after exposure and may be detected for up to 80 hours past consumption. EtG tests whether alcohol has been consumed and is most useful in testing individuals who should not be drinking at all. The threshold for EtG testing is 500 ng/ml and helps to "weed out" most false positives that may occur from incidental environmental exposure to alcohol based products. This product is for FORENSIC USE ONLY. Call 803-932-0818 with questions.