title: The value of laboratory tests for the screening and recognition of alcohol abuse in primary care patients.
abstract: BACKGROUND
  Although alcohol abuse is prevalent in family practice, the diagnosis is not easily established. Laboratory tests are usually heavily relied on in the diagnostic process.
  
  
  METHODS
  The value of laboratory tests for the screening and recognition of problem drinking in family practice is summarized, based on a review of the literature. A distinction is made between studies in selected populations of drinkers and studies in nonselected populations, ie, family practice.
  
  
  RESULTS
  The most sensitive laboratory tests associated with excessive alcohol intake include gamma-glutamyl transferase (GGT), mean corpuscular volume, and the ratio of alanine aminotransferase to aspartate aminotransferase. No single laboratory test or combination of tests is shown to be appropriate for screening. The positive predictive value for GGT is only about 25% in a population that has a 10% prevalence of problem drinking and increases to about 55% in a population that has a 30% prevalence of problem drinking.
  
  
  CONCLUSIONS
  Guidelines for the recognition of problem drinking in family practice should include elevated laboratory test values as one of the "alerting factors" for problem drinking, and not as a confirmation of a suspicion of problem drinking. In monitoring treatment response, GGT may be a powerful patient-motivating factor.
authors.affiliation: Department of Family Medicine, University of Leiden, The Netherlands.
authors.forename: H L
authors.initials: HL
authors.lastname: Hoeksema
authors.forename: G H
authors.initials: GH
authors.lastname: de Bock
mesh_terms: D000410:Alanine Transaminase / Q000097:blood*; D000428:Alcohol Drinking; D000437:Alcoholism / Q000097:blood* / Q000201:enzymology / Q000517:prevention & control* / Q000523:psychology; D001219:Aspartate Aminotransferases / Q000097:blood*; D019411:Clinical Laboratory Techniques / Q000592:standards / Q000706:statistics & numerical data; D004327:Drinking Behavior; D004909:Erythrocyte Indices; D005194:Family Practice; D005260:Female; D006801:Humans; D008297:Male; D008403:Mass Screening; D011237:Predictive Value of Tests; D011320:Primary Health Care; D012647:Self-Assessment; D012680:Sensitivity and Specificity; D005723:gamma-Glutamyltransferase / Q000097:blood*
chemical_list: D005723:gamma-Glutamyltransferase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase