Historically been diagnosed by a trained medical professionals; whether a clinical psychologist or psychiatrist. Due to the lack of knowledge among GPs and the general population, ADHD is can still be considered as a condition associated to childhood. In the UK this has presented problems with obtaining a referral from a GP with the intention of obtaining a medical diagnosis for the purpose of accessing ADHD medication and services through the NHS . For those who wish to consider using medication, obtaining a medical diagnosis is the only way to do this legally. In addition a medical diagnosis can allow for the access of CBT through the NHS or even coaching in the workplace through AtW or in Higher Education through the DSA.
Other than those with a medical background mentioned above, there has been reluctance by professionals with relevant training in psychometric testing to assess for ADHD. This is due to ADHD being considered a medical condition and its association pharmaceuticals and the idea that there is the need for medication. This however is not the case, as medication optional, with the decision being made by the individual with an ADHD diagnosis.