Could C-reactive protein/albumin ratio be an indicator of activation in axial spondyloarthritis?

Objectives: To evaluate the relationship of C-reactive protein (CRP)/albumin ratio (CAR), neutrophil/lymphocyte ratio (NLR), platelet/lymphocyte ratio with Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) in axial spondyloarthritis (AxSpA). Study Design: Cross-sectional study. Place and Duration of Study: Clinic of Rheumatology, Dışkapı Education and Research Hospital, Health Sciences University, Turkey during January 2020-2021. Methodology: One-hundred and nine patients aged >18 years were included. Age, gender, duration of disease, BASDAI scores were recorded. CRP, erythrocyte sedimentation rate (ESR), albumin values, leukocyte, neutrophil, lymphocyte, platelet counts were determined. Results: The mean age and median disease duration of the patients were 45.03±10.63 and 5 (2-6.5) years, respectively. Among these, 28 (58.3%) female and 44 (72.1%) male patients were found to be HLA-B27 positive. BASDAI≥ 4 was observed in 61 (56%) patients and <4 in 48 (44%) patients. CRP, albumin, ESR, NLR and CAR values between the patient groups were significantly different. There was high correlation between BASDAI and CAR. There was a moderate correlation between CAR and BASDAI in the patient group with normal acute phase reactants. Conclusion: There is a significant correlation between CAR value and composite score such as BASDAI, which is commonly used to assess systemic inflammation in Ax-SpA. These methods are reliable, recognised by reimbursement institutions and include measurements that physicians can use practically in routine outpatient clinics. (author)