Question to the Department of Health and Social Care:

To ask the Secretary of State for Health and Social Care, whether he has made an estimate of the number of (a) adults and (b) children currently waiting for an diagnosis of autism.

In England, in December 2024, the Autism Waiting Time Statistics show that there were a total of 212,964 patients with an open suspected autism referral. 129,179 of these patients were aged zero to 17 years old, and 83,837 of these patients were aged 18 years old and over. The median waiting time of all patients across England with an open suspected autism referral, where their first care contact was in the quarter, was 427 days for zero to 17 year olds, and 266 days for over 18 year olds.

It should be noted that since each metric is rounded to the nearest five in the published data, the number of adults and children do not add up to the total number of patients. Data on children and young people in this dataset is expected to be an underestimate and caution should be used when interpreting these statistics, since they are experimental rather than official statistics. The majority of children assessed for autism in the United Kingdom are seen in child development services, which are out of the scope of this dataset. This means the published figures will underestimate the volume of referrals or diagnoses, and the associated impact on health services. NHS England continues to conduct exploratory analysis into the Community Services Dataset, with a view to including autism waiting times data from that dataset.