Patients and methods: In this descriptive study, 282 wrists of 141 healthy individuals (71 females, 70 males; mean age: 29±9.6 years; range, 21 to 55 years) were included between September 2021 and November 2022. The palmaris longus muscle tendon was identified by Schaeffer`s test, Mishra`s test I, Thompson`s test, and Pushpakumar`s test and then evaluated with USG. Before the tests, age, sex, and dominant hand information of the individuals were obtained. The STT and TT were measured with USG.

Results: Sensitivity values by side were as follows (right/left respectively): Schaeffer`s 92%/73%, Mishra`s I 91%/93%, Thompson`s 84%/87%, and Pushpakumar`s 86%/91%. Specificity values by side were as follows (right/left respectively): Schaeffer`s 87%/95%, Mishra`s I 78%/82%, Thompson`s 78%/79%, and Pushpakumar`s 84%/82%. Sensitivity values by sex were as follows (female/male respectively): Schaeffer`s 81%/96%, Mishra`s I 92%/94%, Thompson`s 85%/90%, and Pushpakumar`s 91%/92%. Specificity values by sex were as follows (female/male respectively): Schaeffer`s 68%/90%, Mishra`s I 72%/90%, Thompson`s 72%/85%, and Pushpakumar`s 78%/85%. The intraclass correlation coefficient between clinical tests and USG was 0.94 for the left side and 0.95 for the right side.

Conclusion: Mishra`s test I and Pushpakumar`s test can be used in females, while Schaeffer's test and Mishra`s test I can be used in males as a mutually supportive clinical test. Furthermore, while there may be false negative and false positive test results due to muscle variations, it should be noted that STT/TT is also effective, particularly on the right side. Keywords : Mishra I, Palmaris longus muscle, Pushpakumar, Schaeffer, Thompson, ultrasonography