Each participant underwent a qualitative assessment using the Katz hand diagram , Phalen's Test , and Levine's CTS Questionnaire .
All participants performed the Katz hand diagram, Phalen's Test, and Levine's CTS Questionnaire at baseline.
In a separate analysis, the CTS symptomatic group, although not clinically diagnosed, showed a significant correlation with four commonly used diagnostic tools: a positive Phalen's Test (r = 0.535, p < 0.02), a higher Katz hand diagram score (r = 0.620, p < 0.006), a higher Levine's Symptom Severity score (r = 0.925, p < 0.0005), and a higher Levine's Functional Status score (r = 0.730, p < 0.001).
Slightly to moderately useful tests for ruling in CTS include a decreased ability to perceive painful stimuli along the palmar aspect index finger when compared with the ipsilateral little finger (LR+=3.1), the Katz hand diagram with classic or probable patterns (LR+=2.4), weak thumb abduction (LR+=1.8), abnormal monofilament testing (LR+=1.5), and the Phalen sign (LR+=1.3).
This useful systematic review found that the flick test, a classic or probable Katz hand diagram, hypalgesia, and weak thumb abduction increase the likelihood that a patient will have a positive electrodiagnostic study result for CTS.