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You could filter for TCP expert messages about "previous segment not captured", by filtering for
tcp.analysis.lost_segment
and check the status bar for the number of occurrences. It's not 100% exact under all circumstances but it can give you an idea. With UDP it depends on the application protocol if you can check for packet loss, but it's more complicated because UDP doesn't guarantee packet delivery - which means that there are no checks for lost packets on UDP protocol level like TCP has.
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