I am finding this really difficult. I perform these assessments privately (children not adults) on top of my full time NHS job
I work for a very well respected provider and I try very hard to be robust. I am a doctor. I do face to face appointments and they usually take two hours. I will not diagnose without information from school and conners from school and home. If school information is not supportive, I always get a QB test. If there is suspected it confirmed comorbid asd, I always get a QB test.
But, I diagnose a high proportion that I see. I always felt this was to be expected as parents are obviously sure enough to put over 1000 pounds on the line. Also we screen for free, and advise that people don't have an assessment if they don't meet screening criteria.
Local camhs is a godforsaken mess. 4-5 years for assessment. Very difficult to get any referral accepted. Also periodically they send letters out to their whole waiting list saying that if they still want an assessment, they should get in contact. Loads of the parents also have ADHD and the letters fall by the wayside and the child is taken off a 4 year waiting list.
I actually sometimes think camhs underdiagnose. They are stretched very thin, a diagnosis means follow up and if medication is started, alot of follow up. They have an incentive not to diagnose as strong as the private clinics incentive to diagnose. When I have done NHS contracts for ADHD, I have been advised to basically dissuade parents from considering medication, because the resources for follow up are simply not there. Remember ADHD is a common condition, between 3-5% of the population. That's 1-2 children in every school class.
Also the whole 'it's not ADHD, it's trauma' thing. This is often cycled out for kids, but no help is offered. The kids I see often have had trauma in their first 2 years, so have been exhibiting symptoms their entire life. They show symptoms at home and at school, there functioning is crippled by their symptoms..... But a sniff of trauma and some clinicians will refuse an ADHD diagnosis....even though we know children can have both.
Essentially, as much as you try and corroborate your history and get as much information as possible, there is an element of the clinicians opinion and experience in any diagnosis. I think oversight and hierarchy and a function to discuss difficult and borderline cases (all of which I have) is important. But some times it is a judgement call, based on the evidence in front of you and intevitably sometimes you will get that wrong. The weight of that weighs very heavily on me and I can promise I care about the patients not just the paycheck.