title: The limited value of routine laboratory assessments in severely impaired nursing home residents.
abstract: OBJECTIVE
  To determine the usefulness of a routine, comprehensive battery of laboratory tests in a severely impaired elderly nursing home population.
  
  
  METHODS
  Prospective observational survey.
  
  
  METHODS
  Skilled nursing facility wards of a geriatric and extended care veterans hospital.
  
  
  METHODS
  Consecutive sample of 108 veterans with severe cognitive and functional impairments, who had been hospitalized at least 6 months.
  
  
  METHODS
  Proportions of tests categorized as screening, monitoring, follow-up, or diagnostic; frequency of abnormal test results, interventions warranted and performed on the basis of these abnormalities, and beneficial or adverse effects.
  
  
  RESULTS
  Of 6771 individual nondiagnostic tests performed, 17.2% yielded abnormal results; of these, 33.3% were new. However, only 0.2% of tests resulted in patient benefit. Of 989 panels performed, 31.0% contained at least one abnormality, but only 1.0% of panels (10 patients) yielded any benefit. Overall usefulness was related to the purpose of the testing, with 31.5% of screening tests yielding abnormalities, compared with 45.5%, 78.2%, and 68.7% of monitoring, follow-up, and diagnostic panels, respectively (P < .05 for each compared with screening panels). None of the screening panels detected an abnormality that led to patient benefit, compared with 1.0%, 1.4%, and 3.0% of monitoring, follow-up, and diagnostic panels.
  
  
  CONCLUSIONS
  Routine comprehensive laboratory panels may not be warranted in the most severely impaired elderly patients in long-term care settings. Discontinuing true screening tests and limiting testing strictly to monitoring, follow-up, or diagnostic purposes could minimize the costs of laboratory assessment without losing its potential benefits.
authors.affiliation: Geriatric Service, Edith Nourse Rogers Memorial Veterans Hospital, Bedford, MA 01730.
authors.forename: D E
authors.initials: DE
authors.lastname: Kim
authors.forename: D R
authors.initials: DR
authors.lastname: Berlowitz
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D003955:Diagnostic Tests, Routine / Q000706:statistics & numerical data*; D006233:Persons with Disabilities; D005260:Female; D006746:Hospital Bed Capacity, 500 and over; D006787:Hospitals, Veterans / Q000706:statistics & numerical data; D006801:Humans; D016015:Logistic Models; D008297:Male; D008404:Massachusetts; D008609:Mental Status Schedule; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D011446:Prospective Studies; D015203:Reproducibility of Results; D012866:Skilled Nursing Facilities / Q000592:standards / Q000706:statistics & numerical data*