Internal Interpretation Guidance for Hepatologists
EtG <250 ng/mL - Negative result. No further action required.
EtG = 250-500 ng/mL (&EtS >100 ng/mL) - Low positive result. Result may indicate previous heavy drinking (i.e. 1-3 days), previous light drinking (i.e. 12-36 hours) or recent extraneous exposure e.g. hand-sanitisers, mouthwash.
EtG = 500-1000 ng/mL (& EtS >100 ng/mL) - Positive result. Result may indicate previous heavy drinking (i.e. previous 1-3 days) or recent light drinking (i.e. past 24 hours).
EtG >1000 ng/mL (&EtS >100 ng/mL) - High positive result. Results may indicate heavy drinking on the same day or previously (i.e. previous day or two) or light drinking on the same day.
Due to Rifaximin interference on EtS, only EtG will be used to confirm positive cases of alcohol consumption at UHB.
Please refer to links below for further sources of information for interpretation and sources of positive interference.
