Thyroid function test
As there are no definite brain scans or blood tests to properly diagnose the condition of bipolar disorder, so the doctors order lab tests and perform physical examination to rule out other conditions that might be producing certain behavioral symptoms. Urine analysis and thyroid function test are important for a proper diagnosis of bipolar disorder as they help in determining other factors causing changes in moods. A thyroid function tests determines how well the thyroid gland is functioning because hypothyroidism might induce depressive mood in a person leading to mood disorders. [7]