I also use Infectolab. They do LTT tests, which are not available in my country. Otherwise the results of tests were the same as in my local lab. Except that in my local lab they do also test for bartonella quintana, which Infectolab does not. LTTs are performed also by another labs in Germany and I do not know what is the difference. So the best way, I think, is to combine local tests with Infectolab's (Infectolab is very expensive).