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Table 2 Sensitivity, specificity, positive predictive value and negative predictive value of ultrasound signs for MSU and CPP arthritis

From: A prospective evaluation of ultrasound as a diagnostic tool in acute microcrystalline arthritis

  MSU symptomatic joint MSU multiple joints CPP symptomatic joint CPP multiple joints
Sensitivity (%) 60 84 60 81
Specificity (%) 92 78 80 62
Positive predictive value (%) 92 82 60 52
Negative predictive value (%) 62 77 80 87
  1. The nine patients with both crystals were added to both the MSU and CPP groups
  2. CPP calcium pyrophosphate, MSU monosodium urate