What is the gold standard in ADHD diagnosis?

Adult diagnoses of ADHD in Australia have soared in recent years, but the system is still struggling to support people equitably.An investigation by Four Corners has revealed a complicated picture when it comes to treatment, with hotspots where prescriptions for ADHD medication are far higher than expected, and other pockets of missed diagnosis, where people are being left undiagnosed and untreated.So what's going on here? And if you're someone who's seeking out assessment, treatment or support for ADHD, how do you know where to find it?