Cellmark uses published, validated cut-off levels for the detection of EtG and EtPa in hair which are internationally accepted and recommended by the Society of Hair Testing.
A result above these cut-off levels is strongly suggestive of chronic excessive alcohol use. Below these levels the results are more consistent with normal social drinking and may be used to corroborate a claim of abstinence. However, it is never possible to rule out one-off alcohol use or occasional binge drinking with hair testing alone.
EtG is considered the more reliable alcohol marker in hair, but the combination of EtG and EtPa tests is recommended. Please be aware that low levels of EtPa may be found in the hair of teetotallers and can therefore give a false positive if considered in isolation.
Cellmark concurs with the Society of Hair Testing consensus (revised in 2019) which recommends that testing for EtG and EtPa (together) should be used as part of an overall case assessment. Cellmark also offers blood as well as urine tests which look for other ‘indirect’ indicators of alcohol consumption.
A separate hair sample (minimum 3cm) will be required for alcohol analysis. We only offer an overview analysis (not month by month) to ensure the reliability of the interpretation and do not recommend body hair for the same reason.