Blood Work ??

I've read many times in this forum u should get your blood work to know your igf-1 levels. I've been asking around EVERY WHERE but the only test I've found is a HGH test.
Does it really have to be an IGF-1 test ?
IF it's a HGH test and I started my gh last week I guess the test result will be screwed ? Right?

Thanks RedB, once again u clear things up. I'll keep looking for the igf-1 test