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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]