Q: "What is a syndrome?".
A: "A number of features which occur together as a group and indicate a particular condition; a group of symptoms that appear together."
Doesn't sound like an awful lot of 'lab work' would be necessary for the probable (note the 'light spin' here?) diagnoses for SARS ...
It's not the flu. And it would be very nice if we could tell that early on. I'm sure you agree.