A mental status examination is conducted to obtain information about an individual's current functioning. This examination helps assess their cognitive and emotional state, including their thoughts, feelings, and behaviors at the present time. It provides valuable insights into their mental health, helping professionals make diagnoses, develop treatment plans, and monitor progress. The other options mentioned in the question, such as obtaining information about the individual's childhood, past psychological evaluations, or determining the need for therapeutic services for their family, are not the main purposes of a mental status examination.