Sensitivity, specificity, drinking behaviour and window of assessment of alcohol biomarkers [7,8,23,65,73].

Table 1: Sensitivity, specificity, drinking behaviour and window of assessment of alcohol biomarkers [7,8,23,65,73].

Biomarkers	Sample Source	Sensitivity%	Specificity%	Drinking Behaviour	Window of Assessment
GGT	Serum/Plasma	40-50	80-90	Chronic Heavy Drinking	2-3 weeks
MCV	Blood	60-90	30-75	Chronic Heavy Drinking	2-4 months
ALT/AST	Serum/Plasma	15-69	50-95	Chronic Heavy Drinking	2-3 weeks
CDT	Serum/Plasma	80-90	85-95	Heavy alcohol use	2-3 weeks
5-HTOL	Urine	n/a^**	n/a^**	Recent Use	5-20 hours
PEth	Blood	80-90	90-95	Heavy alcohol use^*	2-4 weeks
FAEE	Serum	> 75	> 75	Recent Use	2-3 days
FAEE	Hair	100	90	Chronic Heavy Drinking	Several Months depending upon hair length
EtG	Urine	73-75	55-60	Recent Use	2-5 days
EtG	Hair	70-90	80-95	Chronic Heavy Drinking	Several Months depending upon hair length

^*= more than 60 grams per day (4-5 standard drinks); ^**n/a = data not available.