Guidance
Clinical investigations for medical devices
How to notify the MHRA of your intention to carry out a clinical investigation for medical devices.
Change of https://www.gov.uk/guidance/notify-mhra-about-a-clinical-investigation-for-a-medical-device
Change description : 2025-10-06 13:08:00: Updated file ‘Clinical investigations of medical devices – guidance for manufacturers’ to reflect the following changes:Clarified EU MDR can be met for GB only studies (page 4)Updated point 5 on when application to MHRA is required and added links on where to find MHRA flow charts (page 6)Some formatting fixes [Guidance and regulation]
Showing diff : 2025-10-01 10:35:56.763162223 +00:00..2025-10-06 12:08:49.823918829 +00:00
How to notify the MHRA of your intention to carry out a clinical investigation for medical devices.
You may need to carry out a clinical investigation as part of the process to obtain a UKCA, CE or CE UKNI marking for your medical device. You must inform the MHRA if you are planning to do this at least 60 days before starting your investigation.
For studies in Great Britain, please use this flow chart and accompanying guidance to determine if you need to submit an application to MHRA. In August 2025, MHRA have published updated versions of these documents. Please review the latest available guidance and ensure you are aware of its contents with respect to clinical investigation applications from this date.
For studies in Northern Ireland or Great Britain and Northern Ireland, use the flow chart and accompanying guidance in the Northern Ireland section below.
Note: applications under Annex XVI of the Medical Device Regulation (EU) 2017/745 (MDR) for devices with no intended medical purpose cannot be accepted in GB.
For specific enquires relating to applications for clinical investigations, contact info@mhra.gov.uk and ensure you add ‘clinical investigation enquiry’ in the subject line.
Follow the guidance on compiling a submission and when preparing your notification application.
Applications are submitted electronically using the Integrated Research Application System (IRAS).
See information for clinical investigators for what is required by clinicians involved in the investigation.
Check the electrical guidance for clinical investigations.
Check the information on the for the scientific data you must submit.
Check statistical considerations for clinical investigations for presenting statistical information for your clinical investigation.
See the guidance on UKCA markings.
The MHRA clinical investigations team can offer a comprehensive device regulatory advice meeting.
We cannot review individual documents but we can provide guidance on navigating the regulatory landscape.
See our information on fees regarding the charges for a regulatory advice meeting
To request a regulatory advice meeting, contact the Head of Clinical Investigations mark.grumbridge@mhra.gov.uk.
When we receive your application for a clinical investigation of a medical device our regulatory handers will validate your application against the Clinical investigation application checklist. Use this checklist to help you submit a valid application.
Note: a notification to the MHRA will not be required for medical devices that are UKCA, CE or CE UKNI marked for the purpose that is under investigation.
A fee under the Medical Devices Regulations 2002:
(a) shall be payable when the notice to which it relates is given to the Secretary of State;
and
(b) shall accompany that notice when it is given.
The fees detailed on our fees page also cover applications for device studies in Northern Ireland
To enable accurate and timely invoicing, you should provide the following information when applying for your clinical investigation:
Once you have received your invoice and made the payment, you should send evidence of payment by email to CI-applications@mhra.gov.uk, quoting the MHRA reference (CI/XXXX/XXX).
In applying the regulation and to avoid delays, you must pay the MHRA upon confirmation of a valid application for a clinical investigation.
We will not provide a final regulatory decision (approval or objection letter) on the application until we have received payment.
This section concerns clinical investigations being conducted in Great Britain only. See the separate section below for studies involving Northern Ireland.
When we have received your documents and validated them, we will contact to you within 5 working days to confirm that the 60-day assessment period has started, or we will let you know if there are any issues. If we raise any issues, the 60-day assessment period will start when we receive a valid response.
Day 1 of the 60 days is taken as being the first day that follows the date of acceptance of a valid application. For example, if an application is received on 24 August and the assessor validates the submission on 28 August, the clock starts on 29 August.
During the assessment, experts will assess the safety and performance of your device as well as the design of the clinical investigation to be carried out. We will write to you if we require further information. It is essential that you contact us as soon as possible if you require clarification.
If there are possible grounds for objection, where possible we will arrange a teleconference for a better understanding and to find a resolution within the 60-day assessment time.
We will send you a letter by the 60th day with a decision (‘objection’ or ‘no objection’) whether or not you can carry out the proposed clinical investigation.
This section concerns clinical investigations with sites in Great Britain, and clinical investigations with sites in both Great Britain and Northern Ireland. Please see the separate section below for studies with Northern Ireland sites only (no sites in Great Britain).
In line with UK Regulations and MEDDEV 2.7/3, all reportable events must be fully recorded and notified to the MHRA. This includes all serious adverse events, irrespective of whether the device has been assessed as having a causal relationship, and reportable events (per MEDDEV 2.7/3) occurring in third countries in which a clinical investigation is performed under the same clinical investigation plan. These can be provided using either the MEDDEV 2.7/3 SAE reporting table, or the MDCG 2020-10/2 SAE reporting table, as long as the required information is included.
Please submit an SAE reporting form in the new MORE portal with your completed table attached.
See details on how to register for the MORE portal.
MEDDEV 2.7/3 also contains further guidance on clinical investigation reporting in Great Britain.
As a condition of MHRA approval for a clinical investigation, in addition reporting individual serious adverse events as detailed above, you must send us quarterly summary reports providing an update on the latest overall safety profile for the investigation.
To provide these summaries, use the . This template is for devices only but you should also use it for device-related reporting on any combined studies. Do not include detail on any investigational medicinal product (IMP) under investigation.
Submit your quarterly summary reports directly through https://more.mhra.gov.uk/login
Email your end of study report to CI-applications@mhra.gov.uk.
Sponsors must notify the MHRA of all deviations (relating to UK study sites only) as soon as they are aware of them. Include details about the nature of the deviation, when it occurred, where it occurred, and any proposed corrective and preventative actions.
Use the following MHRA protocol deviation tracker Excel template when reporting deviations and keep this as a ‘live’ document so that new deviations can be added. This enables both the sponsor and the MHRA to have a complete overview each time it is submitted.
Send the completed spreadsheet by email to info@mhra.gov.uk.
Combined review is the way research teams request approval for clinical trials of investigational medicinal products (CTIMPs) and combined medicine and device trials.
Research teams make a single application using a new part of IRAS, which goes to both the MHRA and a research ethics committee (REC) at the same time. The application also goes for study wide review, such as HRA and HCRW approval, if the study is to take place in the NHS or Northern Ireland HSC.
The regulatory and ethics reviews take place in parallel and any requests for further information (RFIs) are raised jointly. A single response to these requests leads to a single decision from both reviews. Study-wide review is usually issued at the same time as MHRA and REC, but may come later if there are still issues to discuss with the applicant.
IRAS is used for the initial application and supports the trial through amendments right up to the end of the trial. Research teams can allocate different roles in the system for colleagues working on the project.
Further information is available in our Combined IMP device guidance.
This section concerns clinical investigations conducted in Great Britain only. See the separate section below for studies involving Northern Ireland.
Once you’ve received a letter of no objection from us, you must notify us of all proposed amendments to the investigation. You must wait until we send you another letter of no objection before you make the changes.
You must tell us about any changes made to:
If you do not tell us about proposed amendments, you could be liable to prosecution.
Begin your amendment submission on HRA IRAS.
Refer to the IRAS user guide’s section on amendments.
When you notify the MHRA of amendments, include the following:
If you do not follow the guidance above, the submission will be returned to you.
Email the amendments to CI-amendments@mhra.gov.uk, unless the files are too big, in which case contact us at the same email address to request a link for uploading the documents. We will only process amendments submitted to this mailbox. Do not submit amendments to individuals or any other mailbox.
Under the new fees implemented in July 2025 there is no fee payable for any amendment to a clinical investigation.
Sponsors must notify us of the early termination of a clinical investigation and provide a justification for the early termination as stated in Regulations 16(11) and Section 29(10) of the UK MDR 2002.
Send a copy of the final written report of a clinical investigation of a device falling within the scope of the UK MDR 2002 (Regulations 16(10) and 29(9)) to CI-applications@mhra.gov.uk.
Sponsors should also notify us of a temporary halt of a clinical investigation.
Send the notifications to info@mhra.gov.uk.
The Northern Ireland Protocol requires Northern Ireland to continue to align with EU rules for devices after 1 January 2021. Therefore, the Medical Device Regulation (EU) 2017/745 (MDR) and the in vitro Diagnostic Medical Device Regulation (EU) 2017/746 (IVDR) will apply in Northern Ireland from 26 May 2021, and 26 May 2022 respectively, in line with the EU’s implementation timeline.
All clinical investigations requiring application to the MHRA (which involve a site in Northern Ireland) must be submitted to the MHRA in line with the requirements of EU MDR 2017/745.
Note: this single application will also cover any sites proposed in Great Britain in addition to site(s) in Northern Ireland for the same clinical investigation.
For clinical investigations involving a site in Northern Ireland, use this flow chart and accompanying guidance to determine if you need to submit an application to the MHRA.
Please note: MHRA has recently published updates to the GB flow chart and accompanying guidance (see links at the top of this page). As part of this work package, the Northern Ireland flow chart and accompanying guidance documents are also under review, and may be updated in due course. Please check this page regularly to remain up to date with latest guidance on this topic.
The following sections provide guidance for these applications and the requirements for amendments and post market studies involving sites in Northern Ireland.
When we have received your documents and validated them, we will write to you within 10 calendar days to confirm that the application is valid and the assessment has started, or we will let you know if there are any issues. If there are any issues, we will confirm these in writing and provide a 10 calendar day deadline for a response. The assessment will not start until we have received a valid response. If, after receipt of the response, we still consider the application invalid, or the 10 day deadline has expired, we will write to confirm this within 5 calendar days.
Day 1 of the MHRA assessment is taken as being the date that we confirm that we have received a valid application. During the assessment, experts will assess the safety and performance of your device as well as the design of the clinical investigation to be carried out.
We will write to you if we need further information. It is essential that you contact us as soon as possible if you need clarification. If there are possible grounds for refusing authorisation, where possible, we will arrange a teleconference for a better understanding and to find a resolution within the assessment period.
Depending on whether we consult experts, we will inform you of our decision within 45 or 65 calendar days as per the EU MDR. This period will be suspended if we request additional information for a maximum of 7 calendar days for each request, up to a maximum of 3 requests. Any further requests will not result in a clock stop.
We will send you a letter by the final day (or before) with a decision whether or not you can carry out the proposed clinical investigation.
This section concerns clinical investigations with sites in Northern Ireland (but no sites in Great Britain). For studies with sites in Great Britain, or for studies conducted in both Great Britain and Northern Ireland, please see the separate section above.
The reporting requirements of Regulation (EU) 2017/745 apply to these studies.
The sponsor shall fully record all of the following:
The sponsor shall report, without delay to MHRA, all the following:
Reports can be provided using the MDCG 2020-10/2 SAE reporting table.
Please submit an SAE reporting form in the MORE portal with your completed table attached.
See details on how to register for the MORE portal.
MDCG 2020-10 also contains further guidance on clinical investigation reporting for Northern Ireland.
For enquiries please see the above section of this guidance page.
Once you’ve received authorisation from us to conduct the clinical investigation in Northern Ireland, you must notify us of all proposed modifications to the investigation before you make any changes. You must wait until we send you another letter of authorisation before you make substantial modifications. Depending on whether we consult experts, we will send you our decision within 38 or 45 calendar days.
You must tell us about all modifications, but only those considered to be substantial will require authorisation by the MHRA.
Substantial modification includes:
For non-substantial modifications you only need to notify us to ensure our records are up to date. If upon review of the proposed non-substantial modification, we consider it to be in the substantial category, we will inform the sponsor, and the proposed modification should not take place until an MHRA authorisation is received.
Non-substantial modifications are changes that are unlikely to have a substantial impact on the safety, health or rights of the subjects or on the robustness or reliability of the clinical data generated by the investigation and include:
You must notify us of all clinical investigations conducted in Northern Ireland involving CE marked devices that also involve procedures additional to the normal conditions of use of the device, that are also invasive or burdensome.
You must make the notification at least 30 days before starting the study.
When you notify us of these clinical investigations, we need the following information:
Submit your application electronically using the Integrated Research Application System (IRAS).
Sponsors must notify the MHRA of the temporary halt or early termination of a clinical investigation and provide a justification within 15 days, or 24 hours if the decision was taken on safety grounds. The clinical investigation report and summary must be provided within 3 months for such studies that are temporarily halted or terminated early.
Information about changes to the operation of certain clinical investigations and performance studies in Northern Ireland.
Certain clinical investigations and performance studies that take place in Northern Ireland require the sponsors to be established either in Northern Ireland or the EU or to have a legal representative established in Northern Ireland or the EU.
The rules that apply (Medical Device Regulation (Regulation 2017/745) (MDR) and In Vitro Diagnostics Regulation (Regulation 2017/746) (IVDR) allow the UK to disapply these rules.
This requirement applies if the investigation or study is only taking place in its territory and not in the EU. Therefore, the MHRA is disapplying the requirement for the sponsor or their legal representative of a clinical investigation or performance study to be established in Northern Ireland or the EU, provided all of the following conditions are met:
All remaining requirements under the MDR and IVDR apply. This guidance will take immediate effect.
For further information, contact the MHRA info@mhra.gov.uk.
You do not need to notify us of a clinical investigation if:
You may need to notify the MHRA of a clinical investigation if:
See which may be relevant to you.
HRA and HCRW approval applies to all project-based research taking place in the NHS in England and Wales. It brings together the assessment of governance and legal compliance, undertaken by dedicated HRA and HCRW staff, with the independent Research Ethics Committee (REC) opinion provided through the UK Research Ethics Service.
It replaces the need for local checks of legal compliance and related matters by each participating organisation in England and Wales. For information on how to prepare and submit an application for HRA and HCRW Approval, refer to the HRA website.
For more details on classifications, see MEDDEV 2.4/1 for guidance on classifications.
If you have any questions before submitting your notification, email info@mhra.gov.uk.
Updated file 'Clinical investigations of medical devices – guidance for manufacturers' to reflect the following changes: - Clarified EU MDR can be met for GB only studies (page 4) - Updated point 5 on when application to MHRA is required and added links on where to find MHRA flow charts (page 6) - Some formatting fixes
Major update to guidance wording
Changed to add updated guidance on MFRs on clinical investigations jm
Removal of the in vitro diagnostic medical devices (IVDs) guidance
Added new flow chart and guidance documentation for UK and Northern Ireland.
Revised wording in the 'Payment for a clinical investigation' section to remove reference to 'amendments to a clinical investigation'.
Added link to updated SME information (relating to fees).
Updated 'Amendments' and 'Fees' sections to reflect new fees applicable from 16 July 2025.
Updated to add new guidance for manufacturers document.
Changed text for optimisation in both 'Serious adverse event (SAE) reporting’ sections
Updates to section 'Northern Ireland'. Includes attachments for 'flow chart' and 'accompanying guidance' and revised wording underneath SAE reporting.
Information about serious adverse event (SAE) has been updated.
Added link to 'IRAS User Guide - Amendments'.
Updated section on 'Amendments' to reflect changes to the process.
Updated 'In Vitro Diagnostic Medical Devices (IVDs)' section,
Updated to include new QSR template
New section 'Regulatory advice meetings' added to this page.
Updates to clarify the fees and payment process, addition of guidance on early terminations and temporary halts in GB and NI and clarification that Annex XVI applications cannot be accepted in GB.
Updated guidance for manufacturers PDF attachment
Added links to: - guidance for manufacturers on clinical investigations - information for clinical investigators
Added Combined review of a CTIMP and Medical Device section and accompanying guidance Combined IMP Device guidance
'Electrical guidance for clinical investigations' has been uploaded
Updated to add hyperlink on submission guidance
Added template for submitting Quarterly Summary Reports.
Added a PDF on our electrical guidance for clinical investigations. Added information to the 'Amendments' section.
Added document 'Tabular Summary input (template) for non marked IVD devices'.
Updated to include Medical devices: clinical investigations and performance studies in Northern Ireland replacing Temporary Disapplication of Sponsors and Legal Representatives in Northern Ireland.
Added new section, Temporary Disapplication of Sponsors and Legal Representatives in Northern Ireland.
Added information on fees payable in relation to clinical investigation and amendments to clinical investigations.
Updated information on 'MHRA / HRA Coordinated pathway' - Resuming Monday 22 May 2023.
Added Validation Checklist text and document
Updated information on how to submit the SAE reporting form.
Clinical investigation numbers for 2021 have been included.
Added section 'Quarterly Summary Reports'
Added section for "Study deviations" and related XLS.
Uploaded guidance on the MHRA and HRA coordinated assessment pathway
Christmas period extended to 10 January
Information added for notifications for clinical investigation or study amendments between 17 December 2021 and 4 January 2022.
Added a note about clinical trial applications, where clinical performance of the IVD is yet to be demonstrated.
The guidance is being updated due to the EU Medical Device Regulation (MDR) coming into effect in Northern Ireland from 26 May. It provides technical details for clinical investigations in Northern Ireland.
Added information on the number of valid clinical investigation applications that have been reviewed by year.
A new statistical considerations PDF has been added to reflect the end of the Brexit transition period
Updated biological safety assessment pdf
Added revised information about Health Research Authority (HRA) and Health and Care Research Wales (HCRW) Approval. Also added new information about the Coordinated assessment pathway pilot.
This page has been updated due to the end of the Brexit transition period.
This page has been updated due to the end of the transition period
Updated with a message around amendments over the 2020 Christmas period.
Added information about how the MHRA will review clinical investigations submitted before 26 May 2020, and on or after 26 May 2020.
Published an updated version of the 'guidance for manufacturers'.
We have added in a Christmas period notice for 2019.
The Biological Safety Assessment PDF has been updated.
Added a link to new guidance on medical devices regulation in a no deal scenario.
Updated page - new wording and Guidance attachments
Inserted advanced notice of a change section
Information about rules of processing notifications about clinical investigations by MHRA during period of Christmas 2018
New version of guidance for manufacturers published
Changed MHRA address.
Update to recent changes section
New heading "Upcoming changes"
Added information about the IRAS forms and about providing MHRA with advanced notice of your intention to submit a clinical investigation.
Added note to provide MHRA with advanced notice of your intention to submit a clinical investigation.
Information on processing times over the Christmas 2017 period added to the page.
New 'statistical considerations' document added to the page.
New section about IVDs added to the page.
Updated guidance document
Information about new requirement to pay fees for amendments published
Updated guidance
Added information about Christmas period 2016
Added clarification around the start of the 60-day assessment timeframe.
Information on Health Research Authority Approval
Updated guidance for manufactures on legislation for clinical investigations of medical devices.
First published.
2025-10-17 12:34
Updated to include link to combined medicine and device trials guidance.
2025-10-06 13:08
Updated file ‘Clinical investigations of medical devices – guidance for manufacturers’ to reflect the following changes:Clarified EU MDR can be met for GB only studies (page 4)Updated point 5 on when application to MHRA is required and added links on where to find MHRA flow charts (page 6)Some formatting fixes
2025-10-01 11:35
Major update to guidance wording
2025-09-26 12:33
Changed to add updated guidance on MFRs on clinical investigations jm
2025-09-05 15:43
Removal of the in vitro diagnostic medical devices (IVDs) guidance
2025-08-27 11:18
Added new flow chart and guidance documentation for UK and Northern Ireland.
2025-08-05 16:42
Revised wording in the ‘Payment for a clinical investigation’ section to remove reference to ‘amendments to a clinical investigation’.
2025-07-16 14:44
Added link to updated SME information (relating to fees).
2025-07-16 00:01
Updated ‘Amendments’ and ‘Fees’ sections to reflect new fees applicable from 16 July 2025.
2025-04-10 14:23
Updated to add new guidance for manufacturers document.
2025-02-20 16:52
Changed text for optimisation in both ‘Serious adverse event (SAE) reporting’ sections
2024-12-17 17:09
Updates to section ‘Northern Ireland’. Includes attachments for ‘flow chart’ and ‘accompanying guidance’ and revised wording underneath SAE reporting.
2024-12-04 09:51
Information about serious adverse event (SAE) has been updated.
2024-10-25 14:48
Added link to ‘IRAS User Guide – Amendments’.
2024-09-26 09:34
Updated section on ‘Amendments’ to reflect changes to the process.
2024-09-06 08:55
Updated ‘In Vitro Diagnostic Medical Devices (IVDs)’ section,
2024-08-27 11:09
Updated to include new QSR template
2024-08-05 11:45
New section ‘Regulatory advice meetings’ added to this page.
2024-07-02 16:17
Updates to clarify the fees and payment process, addition of guidance on early terminations and temporary halts in GB and NI and clarification that Annex XVI applications cannot be accepted in GB.
2024-04-26 15:15
Updated guidance for manufacturers PDF attachment
2024-04-23 15:43
Added links to: – guidance for manufacturers on clinical investigations- information for clinical investigators
2024-04-10 10:48
Added Combined review of a CTIMP and Medical Device section and accompanying guidance Combined IMP Device guidance
2024-03-20 16:27
‘Electrical guidance for clinical investigations’ has been uploaded
2024-03-14 15:35
Updated to add hyperlink on submission guidance
2024-01-16 10:21
Added template for submitting Quarterly Summary Reports.
2023-12-21 12:21
Added a PDF on our electrical guidance for clinical investigations. Added information to the ‘Amendments’ section.
2023-12-14 13:50
Added document ‘Tabular Summary input (template) for non marked IVD devices’.
2023-08-24 13:45
Added information on fees payable in relation to clinical investigation and amendments to clinical investigations.
2023-06-07 10:29
Updated information on ‘MHRA / HRA Coordinated pathway’ – Resuming Monday 22 May 2023.
2023-05-11 10:43
Added Validation Checklist text and document
2023-01-20 16:29
Updated information on how to submit the SAE reporting form.
2022-11-21 12:45
Clinical investigation numbers for 2021 have been included.
2022-09-21 09:27
Added section ‘Quarterly Summary Reports’
2022-05-19 17:05
Added section for “Study deviations” and related XLS.
