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Table 1 Sensitivity of commonly used laboratory tests for diagnosing chronic arthritis in children#

From: Commentary – ordering lab tests for suspected rheumatic disease

Test cited as reason for referral Number Referred JRA/JIA Other
IgM-RF 16 3 (19%)* 13 (81%)
ANA 90 14 (16%) 76 (84%)
  1. # – Summary of data from McGhee et al, ref. [5]