Install the debian-security-support package from the version you want LTS
for, and then run 'check-support-status'. That will tell you whether you
have any packages installed that will not be supported by LTS.
Given that Debian supports in-place upgrades, and that they work very
well, I'd be inclined to not bother with LTS and just keep the system up
to date, but I recognise that others may feel differently.
-- 
"A champion is someone who gets up when he can't" - Jack Dempsey
    
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