UCL Institute of Health Informatics


Accessing CALIBER resources

The CALIBER resource

What is CALIBER?

CALIBER is an established research platform consisting of a combination of highly trained staff, data resources and tools, specialised infrastructure, and training and support, led from the UCL Institute of Health Informatics  that supports access to anonymised NHS data under licence from the Clinical Practice Research Datalink (CPRD).

What data are represented within CALIBER?

Data are “research ready” variables extracted from linked NHS electronic health records and administrative health data under licence from CPRD. Data sources accessible through the CALIBER platform (primary care, secondary care (Hospital Episode Statistics inpatient, outpatient, A&E and diagnostic imaging dataset data) and national registry social deprivation and mortality data from the Office for National Statistics) are available for collaborative research projects with UCL researchers. A full list of data sources available for linkage for research by CPRD can be accessed at: https://www.cprd.com/linked-data.

Who can apply to use CALIBER resources?

CALIBER operates a collaboration-driven data sharing platform and prioritises collaborations based on scientific-added value, capacity development and sustainable funding. Access to CPRD data on the CALIBER platform to facilitate collaboration with academic, National Health Service and commercial partners follows CPRD’s data access governance policies.

How can I apply to use CALIBER resources?

Initial enquiries should be directed to Natalie Fitzpatrick, Data science Facilitator. 

Steps involved in accessing linked CPRD data are summarised in the CALIBER project cycle figure below. Projects will be reviewed for feasibility by the CALIBER Data Lab team and availability of funding. All projects must subsequently be approved by the CPRD Independent Scientific Advisory Committee (ISAC), the non-statutory expert advisory body which oversees access to linked CPRD data for research purposes (https://www.cprd.com/Data-access).

To access linked CPRD data via the CALIBER platform, researchers must sign data access agreements with UCL. Non-UCL collaborators must apply to CPRD to become a CPRD approved client and sign a sub licence agreement with UCL.

All manuscripts submitted for publication must cite CALIBER and include standardised wording acknowledging the use of CPRD data, this wording is available from the CALIBER Data Lab team. 

What happens after my project is approved?

Researchers will complete a data specification form and data linkage will be carried out by the CPRD. Anonymised data will then be transferred using secure methods into the UCL data safe haven, where they will be made available to approved researchers named on the ISAC who have undergone relevant information governance, data safe haven and CPRD (online eLearning) training.

The Data Lab will work closely with researchers to define and extract the cohort (dataset) according to agreed specifications. Researchers will be guided through the whole process by the CALIBER data facilitator.


Access to CALIBER resources - Fees

Charges will apply to cover CALIBER Data Lab’s data management and support (cohort definition, data extraction) and use of specialised infrastructure such as the Data Portal and the safe haven environment. We encourage researchers to consider these costs in grant applications.

There is no additional fee to access CPRD licensed data for any organisation who holds a site licence directly with CPRD to access the data required for the specific collaborative ISAC-approved project. If the collaborating research organisation does not hold a licence to CPRD data, data access licence fees will be applied.

A guide to fees can be found here: 


Costs will vary according to the type of organisation/affiliation.

To discuss costs or if you have any questions, please email Natalie Fitzpatrick, Data Science Facilitator. 

Resources and Capacity building 

What training and support are available?

The UCL Institute of Health Informatics has extensive experience in completing ISAC applications and can help guide you through the process. CPRD has an established online training module which should be completed by investigators with no previous experience with CPRD data. Our Institute also offers specialist training to equip researchers with the skills and knowledge to code and analyse large, linked datasets. A series of taught short courses are available spanning a wide range of basic and applied health research applications including how to use national patient data in research, and courses on genomics and ehealth, data visualisation, SQL and information governance.  More information about our courses is available at: https://www.ucl.ac.uk/health-informatics/study/continuing-professional-development 

What is the CALIBER Data Portal? To access the CALIBER data portal, please click here

To facilitate research and promote transparency, all definitions of research variables using data sources in CALIBER are available in the public domain and are available to view on the CALIBER data portal, an interactive online repository of phenotyping algorithms defining over 90 diseases and metadata.

To request access to the CALIBER Data Portal, please click here.

What type of computer and eInfrastructure is available and how can I access it?

CALIBER research is supported through provision of access to specialised infrastructure including 300 terabytes of high performance data storage platforms to support computationally intensive research. All data are made available to researchers in a secure data safe haven environment located at UCL IHI/Farr Institute, London and which may be accessed remotely.

How do I set up an account on the data safe haven?

Once your project proposal (ISAC) has been approved, please email Natalie Fitzpatrick who will coordinate your registration with the UCL Identifiable Data Handling Service (IDHS) and set up a new share for your project on the safe haven. Training on use of the data safe haven environment and high performance computing facilities will be provided by UCL Information Services Department (ISD).