Test-retest repeatability

#1
Multiple tests (same test/variable) have been carried out on 20 different subjects by the same investigator. Each subject was tested 1, 2 or 3 times (most of them). How do I measure repeatability of the test result within each subject and overall based on the results from the 20 subjects? i.e.: how do I make sure that the outcome of the test is repeatable?
Intraclass Correlation Coefficient (ICC), Coefficient of Repeatability (CoR), Coefficient of Variation (CoV), graphical method through Bland-Altman plots, ...? Any idea on which coefficient/method should be preferred over another one in such a case and why? I have excluded Pearson's as more than two tests were performed on most of the subjects.

Thanks
 
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