Do you remember multiple choice tests? The hardest questions offered options "d) some of the above" and "e) all of the above." But you never got an "it depends" option, at least until now. So, just like Jeopardy, here's the question answered by "it depends." Which technology is best for immune monitoring and biomarker discovery? Let's explore assays that study serum or plasma , in a simple and clear way, with a special focus on impact. I've color-coded the discussion points