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Table 4 Sensitivity, specificity, positive predictive value and negative predictive value of X-ray imaging 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 (%) 5.6 19 55 58
Specificity (%) 100 100 82 79
Positive predictive value (%) 100 100 65 64
Negative predictive value (%) 53.8 55 77 78
  1. The nine patients with both crystals were added to both the MSU and CPP groups
  2. CPP calcium pyrophosphate, MSU monosodium urate