Case Report
Copyright ©The Author(s) 2023.
World J Clin Cases. Dec 26, 2023; 11(36): 8542-8550
Published online Dec 26, 2023. doi: 10.12998/wjcc.v11.i36.8542
Table 1 Laboratory indices of rheumatologic disorders
Specific test
Individual result (normal range)
Test results in context of undifferentiated connective tissue disease[16]
Anti-Smith antibody< 0.2 AI (≤ 0.9)Highly sensitive for SLE
Anti-DS DNA< 12 IU/mL (< 30)Specific to SLE
SSA Ab (anti-Ro AB)< 0.2 AI (≤ 0.9)Seen as elevated in 90% of those with Sjogren’s and in 40%-50% of those with SLE
SSB AB (anti-La Ab) anti< 0.2 AI (≤ 0.9)
Scleroderma Ab IgG< 0.2 AI (≤ 0.9)Specific to scleroderma but can be found as positive in combined rheumatologic disorders
Jo-Ab< 0.2 AI (≤ 0.9)Positive in dermatomyositis and polymyositis and in other CTD
Ribosomal RNP< 0.2 AI (≤ 0.9)Nonspecific index seen in SLE and other rheumatologic disorders
Scleroderma AB IgG< 0.2 AI (≤ 0.9)Specific to scleroderma