title: Severity of COPD at initial spirometry-confirmed diagnosis: data from medical charts and administrative claims.
abstract: OBJECTIVE
  This study was conducted to determine COPD severity at the time of diagnosis as confirmed by spirometry in patients treated in a US managed care setting.
  
  
  METHODS
  All patients with one or more inpatient stays, one or more emergency department visits, or two or more outpatient visits with diagnosis codes for COPD during 1994-2006 were identified from the Lovelace Patient Database. From this group, a subset of continuously enrolled patients with evidence in claims of a first available pulmonary function test or pulmonary clinic visit and a confirmatory claim for a COPD diagnosis was selected. Medical chart abstraction was undertaken for this subset to gather information for diagnosis and severity staging of each patient based on the Global Initiative for Chronic Obstructive Lung Disease (GOLD) criteria for COPD.
  
  
  RESULTS
  Of the 12,491 patients with a primary or secondary COPD diagnosis between 1994 and 2006, there were 1520 continuously enrolled patients who comprised the study cohort. Among the 648 eligible records from patients with evidence of a pulmonary function test, 366 were identified by spirometry as having COPD of GOLD stage I or higher (average percentage of predicted forced expiratory volume in 1 second: 60%): 19% were diagnosed at the stage of mild disease (GOLD stage I); 50% at moderate disease (GOLD stage II); and 31% at severe or very severe disease (GOLD stage III or IV, respectively). The majority of patients in these groups were not receiving maintenance treatment.
  
  
  CONCLUSIONS
  The results demonstrate a very low incidence of early-stage diagnosis, confirmed by a pulmonary function test, of COPD in a large US sample and support calls for increased screening for COPD and treatment upon diagnosis.
authors.affiliation: Lovelace Clinic Foundation, Albuquerque, NM 87106, USA. doug.mapel@lcfresearch.org
authors.forename: Douglas W
authors.initials: DW
authors.lastname: Mapel
authors.forename: Anand A
authors.initials: AA
authors.lastname: Dalal
authors.forename: Christopher M
authors.initials: CM
authors.lastname: Blanchette
authors.forename: Hans
authors.initials: H
authors.lastname: Petersen
authors.forename: Gary T
authors.initials: GT
authors.lastname: Ferguson
mesh_terms: D000328:Adult; D000368:Aged; D015897:Comorbidity; D004636:Emergency Service, Hospital; D005260:Female; D005541:Forced Expiratory Volume; D006279:Health Maintenance Organizations; D006801:Humans; D007297:Inpatients; D008168:Lung / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D009516:New Mexico / Q000453:epidemiology; D010045:Outpatients; D017410:Practice Guidelines as Topic; D011237:Predictive Value of Tests; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000453:epidemiology / Q000503:physiopathology / Q000628:therapy; D012720:Severity of Illness Index; D013147:Spirometry; D013997:Time Factors; D014797:Vital Capacity