Interesting, I interpreted it the opposite way. One of the big problems with depression, bipolar and other physically manifesting mental health issues is that s

Interesting, I interpreted it the opposite way. One of the big problems with depression, bipolar and other physically manifesting mental health issues is that seems to be a large portion of society which says "you just need to snap out of it" (or variations on that theme). With an actual blood test to say "look, this is a physical thing" it becomes easier to ignore those who say such crap -- they can be classified with those who say "oh you have cancer, just pray your way out of it, it's not a real problem". Basically, and objectively measurable way of proving a problem gives the sufferer a chance to not blame themselves (potentially making the problem worse, or at least recovery harder).