West Essex CDC in Epping is one of ten Community Diagnostic Centres (CDCs) in the region open out of usual hours in evenings and weekends.
The centres are open 12 hours a day, seven days a week and are designed to help cut waiting times.
Adam Cayley, regional chief operating officer for NHS England in the East of England, said: “Community Diagnostic Centres are all about making life easier for patients, and bringing down waiting lists.
“Access to vital tests, checks and scans at CDCs can be quicker and more convenient for people, fitting in around their busy lives.
“Extending opening times to evenings and weekends will make faster diagnosis even easier, and help us tackle health inequalities in our communities across the region.”
The centres have already delivered nearly 1.2 million tests and scans since first opening in 2021.
That figure is expected to rise as more CDCs introduce out-of-hours services.
The centres are located in community settings such as shopping centres and local hospitals.
Patients can be referred to a CDC by their GP or hospital-based clinical team.
The centres support the Government’s Plan for Change.