1. Disease-associated reference intervals for twenty laboratory tests in patients with rheumatoid arthritis, Crohn’s disease or ulcerative colitis
- Author
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Arild Faxvaag, Gustav Mikkelsen, and Børge Lillebo
- Subjects
Crohn’s disease ,030213 general clinical medicine ,medicine.medical_specialty ,Medicine (General) ,Clinical Biochemistry ,Disease ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,R5-920 ,Internal medicine ,Full Length Article ,medicine ,In patient ,Medical diagnosis ,Rheumatoid arthritis ,QD1-999 ,Crohn's disease ,Radiological and Ultrasound Technology ,business.industry ,Reference intervals ,medicine.disease ,Comorbidity ,Ulcerative colitis ,Chemistry ,business - Abstract
Background Population based reference intervals are fundamental for interpreting results for quantitative laboratory tests. In patients with a specific chronic disorder, however, results of various tests may regularly be different than in healthy individuals. Health-associated reference intervals may therefore have limited value in such patients. Instead, disease-associated reference intervals may be useful, as they describe the results distribution in populations resembling the specific patients. Few disease-associated reference intervals are available in the literature. The aim of this study was to estimate reference intervals for common laboratory tests for patient populations with rheumatoid arthritis, Crohn’s disease or ulcerative colitis without significant comorbidity, using a novel algorithm. Material and methods Laboratory test results and hospital discharge diagnoses were collected for relevant patients. An algorithm was developed to identify discharge diagnoses significantly associated with high or low results for specific tests. After excluding patients with such diagnoses, reference intervals were estimated, representing results distributions in patients with each of the specific chronic disorders, but without significant comorbidity. Results Disease-associated reference intervals were estimated for 20 common laboratory tests. Most of the estimated reference limits were significantly different from corresponding health-associated reference limits. Thirty percent of the estimated reference intervals were different from estimates based on crude patient populations, indicating that the algorithm applied managed to exclude patients with relevant comorbidity. Conclusion Disease-associated reference intervals could be estimated for a number of tests in patients with rheumatoid arthritis, ulcerative colitis or Crohn’s disease using a highly automated algorithm based on routinely recorded patient data., Highlights • Patients with chronic disorders have different lab results than healthy individuals. • Reference intervals for patients with chronic disorders are often lacking. • We estimated reference intervals for patients with chronic inflammatory disorders.
- Published
- 2021