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Mental Health Test - What You Need to Know A mental health test is an array of assessments and tests administered by professionals. It can last 30 to 90 minutes based on the purpose of the assessment. The test may consist of written or verbal tests. You may be asked about your medications, nutritional supplements or herbal remedies. A primary care doctor may be able to diagnose mental illness, but will typically refer the patient to a psychologist or psychiatrist for more thorough testing.