Dis-ease. Semantics. There can be morphological (http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2785515/) and biochemical indicators of depression and anxiety.

To make mice depressed they will do a forced swimming test (poor mice). So this is another way to induce depression: physical+psychological stress.

If there were good science with good funding it's feasible to come up with a lab test for depression--and anxiety--that's very, very accurate.

No, the article is incorrect. It does not have citations either. Explore pubmed for plenty of information. (Keep in mind the sad reality is that even good science is wrong lots of the time--I'm hedging, okay most of the time.)

The risks of not properly treating depression and anxiety is very, very high. So the article is very irresponsible in my opinion.