How are abnormal results for liver function tests dealt with in primary care? Audit of yield and impact

Objective To determine whether abnormal results for liver function tests are investigated in primary care and findings on full investigation. Design Retrospective audit and prospective clinical investigation. Setting University hospital and surrounding general practices serving a round 330 000 people. Subjects Adults with abnormal results for liver function based on tests requested by their doctor between 1 January and 30 June 1995. Interventions All patients with gamma -glutamyltransferase, alanine aminotransferase, or alkaline phosphatase concentrations at least twice the upper limit of the reference range were studied. A median of 15 months later (range 12-21) records of hospital attendances and further investigations were examined. Where investigations were incomplete the records from the general practiced were examined, and suitable patients were invited to attend the liver clinic. Main outcome measures Investigations requested by the doctor and final diagnoses reached. Results 933 patients with abnormal liver function tests were identified follow up data were obtained in 873 (94%). 531 patients were already under hospital review. Of the remaining 342 patients, 157 were suitable for investigation; the others had died, moved away, were elderly, or had repeat liver function tests with normal results. No further tests were requested for 91 (58%) of these patients. 66 had been partially investigated by their doctor, and in seven patients results suggesting a treatable chronic liver disease had not been followed up. On investigation, 97 (62%) had an identifiable diagnosis requiring hospital intervention for follow up, or both. Conclusions Abnormal results for liver function are often not adequately investigated, missing an important change of identifying treatable chronic liver disease.