Laboratory Medicine ›› 2019, Vol. 34 ›› Issue (8): 704-709.DOI: 10.3969/j.issn.1673-8640.2019.08.007

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Role of RDW combined determination with NLR in ankylosing spondylitis

WANG Jing, ZHENG Qun, JIN Xiaxia, LU Guoguang, SHEN Bo()   

  1. Taizhou Hospital of Wenzhou Medical University,Taizhou 317000,Zhejiang,China
  • Received:2019-01-04 Online:2019-08-30 Published:2019-08-27

Abstract:

Objective To study the combined diagnostic role of red blood cell distribution width(RDW) and neutrophil to lymphocyte ratio(NLR) for ankylosing spondylitis(AS),and to investigate the relations with disease activity and severity. Methods A total of 78 AS patients and 78 healthy subjects were enrolled. The results of blood routine test,erythrocyte sedimentation rate(ESR),C-reactive protein(CRP),immunoglobin(Ig)A,IgG and IgM and other laboratory indicators were recorded. AS patients were classified into stage Ⅰ,Ⅱ,Ⅲ and Ⅳ according to the results of magnetic resonance imaging(MRI). The relationship between RDW,NLR and the activity of AS was evaluated by Spearman analysis. Receiver operating characteristic(ROC) curve was used to obtain the areas under curves(AUC) and the cut-off values of RDW,NLR and RDW combined with NLR for the diagnosis of AS. AS patients were classified according to the cut-off values of RDW and NLR,and the difference of laboratory indicators was compared between the groups. Results NLR,ESR,CRP,RDW,IgG,IgA and IgM had statistical significance between AS group and healthy control group(P<0.05). Both RDW and NLR were correlated with CRP and ESR (r=0.231,0.306,0.352 and 0.343,P<0.05). The AUC of RDW,NLR and RDW combined with NLR for the diagnosis of AS were 0.784,0.725 and 0.812,respectively. The cut-off value of RDW was 13.2,the sensitivity was 59.0%,and the specificity was 96.2%. NLR had a cut-off value of 2.14,a sensitivity of 60.3% and a specificity of 79.5%. The sensitivity of the combined determination of NLR and RDW was 61.5%,and the specificity was 94.9%. The ESR of AS patients with RDW≤13.2 was lower than that with RDW>13.2(P=0.014),and AS patients with NLR≤2.14 had lower CRP than that with NLR>2.14(P=0.018). There was no statistical significance in RDW and NLR among the different stages of AS patients(P>0.05). Conclusions RDW combined with NLR can be used as a new auxiliary diagnostic indicator for AS patients,which can reflect disease activity but not disease severity.

Key words: Red blood cell distribution width, Neutrophil to lymphocyte ratio, C-reactive protein, Erythrocyte sedimentation rate, Ankylosing spondylitis

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