Antithyroid antibodies are relevant to mental health clinicians because hypothyroidism affects mental health and its treatment and because some psychotropic medications, especially lithium, can cause hypothyroidism. Antithyroid antibodies include: 1. Antithyroid peroxidase autoantibodies (anti-TPO, previously called thyroid antimicrosomal antibodies) 2. Antithyroglobulin antibodies (also called thyroid peroxidase antibodies) 3. Antimicrosomal antibodies 4. Anti-TSH receptor antibodies But the…