Laboratory Medicine ›› 2020, Vol. 35 ›› Issue (7): 695-698.DOI: 10.3969/j.issn.1673-8640.2020.07.015

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Establishment of reference interval of human leukocyte antigen-B27 in apparent healthy children

ZHANG Li1, GE Liang1, ZHANG Lanfang2, MA Xiaoli1, SUN Linchun2()   

  1. 1. Department of Clinical Laboratory,Jiangsu Province Academy of Traditional Chinese Medicine,the Affiliated Hospital of Integrated Traditional Chinese and Western Medicine,Nanjing University of Chinese Medicine,Nanjing 210009,Jiangsu,China
    2. Pediatric Research Center,Children's Hospital of Nanjing Medical University,Nanjing 210008,Jiangsu,China
  • Received:2019-05-24 Online:2020-07-30 Published:2020-08-04

Abstract:

Objective To establish the reference interval of human leukocyte antigen-B27(HLA-B27) in apparent healthy children,and to provide a reference for the diagnosis and differential diagnosis of juvenile idiopathic arthritis(JIA)enthesitis related arthritis(ERA) in children. Methods A total of 460 children without conscious spine,peripheral joints,inflammation around the joints or other lesions were enrolled to establish the reference interval. Another 200 apparent healthy children and 50 ERA children were enrolled to verify the reference interval. Peripheral blood HLA-B27 was determined,and the reference interval was established and verified. Results The HLA-B27 mean fluorescence intensity of 460 children showed a skewed distribution(Z=1.615,P=0.011),which was 100(78-121) expressed as median(M) [percentiles(P2.5-P97.5)]. There was no statistical significance for the mean fluorescence intensity of HLA-B27 with different ages and sex(P>0.05). The percentile method was used to establish a 97.5% reference interval on one side,and the HLA-B27 reference interval was <121. Consistency comparison results showed that the new reference interval and the HLA-B27 reference interval provided by manufacturer(0-147) showed a poor consistency(kappa=0.013,P<0.001). According to the new reference interval,the abnormal rate of HLA-B27 in 200 apparent healthy children was 5%,and the positive rate of HLA-B27 in 50 children with ERA was 78%. According to the reference interval provided by manufacturer,the abnormal rate of HLA-B27 in 200 apparent healthy children was 3%,and the positive rate of HLA-B27 in 50 children with ERA was 26%. There was no statistical significance for the abnormal rate of HLA-B27(χ2=1.41,P>0.05),and the difference of positive rate fo HLA-B27 had statistical significance(χ2=49.18,P<0.001). Conclusions The reference interval of HLA-B27 in peripheral blood of children in Nanjing has been established. The specificity of reference interval for the diagnosis of ERA is not different from the reference interval provided by manufacturer,but it improves the diagnostic sensitivity and decreases the rate of missed diagnosis.

Key words: Human leukocyte antigen-B27, Children, Reference interval, Flow cytometry

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