title: The role of routine assays of serum amylase and lipase for the diagnosis of acute abdominal pain.
abstract: BACKGROUND
  We aimed to evaluate the role of routine measurements of serum amylase and lipase in the diagnosis of acute abdominal pain.
  
  
  METHODS
  We identified all patients who had serum amylase and lipase assays over a 62-day period at a single university teaching hospital and reviewed their case notes.
  
  
  RESULTS
  We excluded 58 of the 1598 patients on grounds of ineligibility (< 18 years of age and those transferred from other hospitals). A complete data set was obtained for 1520 (98.7%) of the remaining 1540 patients. Only 9.1% of requests were based on a clinical suspicion of acute pancreatitis. Of the 44 (2.9%) patients who had acute pancreatitis, only 28 (63.6%) had an associated rise in serum amylase and/or lipase 3 times above the maximum reference range, the remainder being diagnosed radiologically. At this cut-off range, the sensitivity and specificity for serum amylase were 50% and 99%, and those for serum lipase 64% and 97%, respectively.
  
  
  CONCLUSIONS
  Routine measurements of serum amylase and lipase are unhelpful in the diagnosis of acute abdominal pain unless there is clinical suspicion of acute pancreatitis. In these patients, assay of lipase alone is preferable to assay of amylase alone or both enzymes.
authors.affiliation: Division of Gastrointestinal Surgery, Nottingham Digestive Diseases Centre Biomedical Research Unit, Nottingham University Hospitals, Queen's Medical Centre, Nottingham, UK.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Sutton
authors.forename: David J
authors.initials: DJ
authors.lastname: Humes
authors.forename: Gemma
authors.initials: G
authors.lastname: Purcell
authors.forename: Janette K
authors.initials: JK
authors.lastname: Smith
authors.forename: Frances
authors.initials: F
authors.lastname: Whiting
authors.forename: Tom
authors.initials: T
authors.lastname: Wright
authors.forename: Linda
authors.initials: L
authors.lastname: Morgan
authors.forename: Dileep N
authors.initials: DN
authors.lastname: Lobo
mesh_terms: D015746:Abdominal Pain / Q000209:etiology*; D000681:Amylases / Q000097:blood*; D004796:Clinical Enzyme Tests / Q000191:economics; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D008049:Lipase / Q000097:blood*; D008297:Male; D008485:Medical Audit; D008875:Middle Aged; D010195:Pancreatitis / Q000175:diagnosis*; D012680:Sensitivity and Specificity
chemical_list: D008049:Lipase; D000681:Amylases