A nurse is providing teaching to the parents of a 6-year-old child who is suspected to have attention deficit hyperactivity disorder (ADHD). Which of the following statements should the nurse make to describe the diagnostic process for ADHD?

A. "Blood tests and scans are typically used to confirm the diagnosis of ADHD.": There are no laboratory tests or imaging studies that can definitively diagnose ADHD; diagnosis is based on behavioral assessment and history. B. "We can use a computer-based test to definitively diagnose your child with ADHD.": Computer-based or neuropsychological tests can assist in assessment but cannot independently confirm ADHD. Diagnosis requires a comprehensive clinical evaluation. C. "Clinical manifestations of ADHD must be observed for at least three months to be considered for diagnosis.": Current guidelines require symptoms to be present for at least 6 months, not 3 months, to meet diagnostic criteria, so this statement is inaccurate. D. "Diagnosis of ADHD primarily relies on the results of comprehensive diagnostic studies.": Comprehensive diagnostic studies" refers to the holistic collection of data. This includes standardized rating scales (like the Vanderbilt or Conners scales) completed by parents and teachers, a detailed developmental history, physical examination, and clinical observation.