-> You ask patients a bunch of things like "Do you ever feel really happy, then really sad?". If they say 'yes' to enough of these questions, you start to worry.
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-> Some psychiatrists love this test. I hate it. Patients will say "Yes, that absolutely describes me!" and someone will diagnose them with bipolar disorder. Then if you ask what they meant, they'd say something like "Once my local football team made it to the Super Bowl and I was really happy, but then they lost and I was really sad." I don't even want to tell you how many people get diagnosed bipolar because of stuff like this.
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-> There was a study that supposedly proved this test worked. But parts of it confused me, and it was done on a totally different population that didn't generalize to hospital inpatients.