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How bipolar disorder is diagnosed?

Can different doctors give different diagnosis? I ask this because I have a close family member that was diagnosed with bipolar disorder but other psychiatrist didn’t diagnose with bipolar disorder.

Is the diagnosis bases only on descriptions from the patient of how he feels or is there any tests available to diagnose like for Alzheimer’s?

Is bipolar disorder hereditary?

Thank you so much. Your reply is really helpful. All this IAmA is really helpful. Thank you for organising this