Do you or does someone you know meet the DSM-5 criteria for someone with narcissistic personality disorder?
The Narcissistic Personality Inventory (NPI) is the test most used in psychological research of narcissism and narcissistic personality disorder. While there are actually several versions of the NPI, this 40-question, "forced-choice" version is the one most researchers prefer. Based on the DSM clinical criteria for narcissistic personality disorder (NPD), the NPI means to measure these features in the general population.
Warning: this test is considered controversial because it's possible to score high even if you aren't a toxic narcissist - because, based on the test, ALL narcissism is "bad" - but in reality, there is such a thing as a healthy amount of narcissism.