How to Register a Systematic Review on PROSPERO: A Step-by-Step Guide

Before you screen a single study, register your protocol. That’s the short version.

PROSPERO is a free public database where you write down what you plan to study and how, before you actually do it. It sounds like paperwork. It isn’t. Registering keeps you honest with your own methods, saves you from repeating a review another team already has underway, and gives editors proof that your plan came first and your results came second. Plenty of journals now ask for the number at submission, and finding that out after your review is finished is a bad afternoon.

Here’s what PROSPERO covers, what to have ready, If you haven’t planned the review itself yet, start with how to write a systematic review and meta-analysis and come back, the form assumes those decisions are already made. how to work through the form, and what usually goes wrong.

What Is PROSPERO?

PROSPERO stands for the international prospective register of systematic reviews. The Centre for Reviews and Dissemination at the University of York runs it, and it costs nothing to use. You submit a summary of your systematic review protocol before the review starts. Once the record is accepted, anyone can search and read it.

To be eligible, your review needs a health-related outcome. That covers more ground than people expect: clinical medicine, public health, nursing, social care, welfare, education, crime and justice, international development. If the review reports something that affects human health, it usually qualifies. A meta-analysis sitting inside a systematic review is covered by the same record.You register once and the pooled analysis rides along with it. What comes next is the harder part, our 12-week meta-analysis module covers effect measures, pooling and heterogeneity end to end.

What doesn’t qualify? Narrative reviews. Scoping reviews. Plain literature reviews. Bibliometric work. And any review that has already moved past data extraction. None of that makes them lesser work. A narrative review is a genuinely smart first project for IMGs, and it needs no registration at all.

The advantage of prospective registration is that your methods are public and time-stamped. Nobody has to take your word for it.

Why Should You Register Your Systematic Review Before Starting?

Prospective registration simply means you register before screening and data extraction begin. The timing is what matters.

Think about what happens otherwise. You run the searches, you look at the data, and one outcome turns out to be far more interesting than the one you started with. Swapping them feels reasonable in the moment. It’s also exactly how bias creeps into a review. A registered protocol makes that kind of change visible instead of invisible.

So, four reasons to do it early:

• Selective reporting becomes much harder, because your outcomes are locked in before you know the answer.
• Readers can hold your final paper up against your original plan.
• A registration number tells editors you had a method, not a hunch.
• You avoid duplication, since you can search the register first and see who else is working on your question.

A lot of journals now require registration. Some won’t even send an unregistered systematic review out for peer review.

Before You Begin: What You Need to Prepare

You can’t fill this form out from memory. It asks for real methodological detail, so pull the following together first:

• Your research question in PICO form: population, intervention, comparator, outcome
• Objectives, stated in a sentence or two
• Eligibility criteria, including study designs, populations, language limits, and date limits
• A search strategy, with the full search string for at least one main database PROSPERO wants the actual string, not a description of it. If building one from scratch is the sticking point, using PubMed effectively for medical research covers MeSH terms, Boolean operators and field tags.
• Your database list, usually PubMed, Embase, Scopus, Web of Science, and the Cochrane Library
• Outcomes, split into primary and secondary
• The risk of bias tool you’ll use, such as RoB 2, ROBINS-I, or Newcastle-Ottawa
• A data extraction plan: how many reviewers, and how you’ll settle disagreements
• Analysis methods, including your model for meta-analysis and how you’ll handle heterogeneity
• Start and expected completion dates
• Team members, with affiliations and working email addresses

Most people who do this regularly write the full protocol first and then copy pieces into the form. A systematic review protocol template built around PRISMA-P works well for this. It also means the answers already exist somewhere when a reviewer asks you to clarify something.

Step-by-Step Guide to Completing the PROSPERO Registration Form

Step 1: Create a PROSPERO account

Sign up on the PROSPERO site with your institutional email. You’ll need to verify the address before you can submit anything. Everyone on your review team gets asked to confirm their involvement too, so check that their email addresses are current. Old university addresses cause more delays than you’d think.

Step 2: Start a new registration

Log in and open a new registration from your dashboard. Before you type anything, search the existing records for your topic. Better to find out now than three months in. Drafts save, so you don’t need to finish in one sitting.

Step 3: Complete the PROSPERO registration form

The PROSPERO registration form is broken into sections. Take them in order.

• Review title. Be specific. Name the population, the intervention, and the type of review.
• Background. Two or three sentences on why the review is needed.
• Objectives. What exactly will this review answer?
• Eligibility criteria. Inclusion and exclusion criteria for population, intervention, comparator, outcomes, study design, and setting. Write them so a stranger could apply them.
• Search strategy. Every database, with date ranges, plus your search string. Note that syntax differs between databases, so a PubMed string won’t transfer to Embase as is.
• Outcomes. Primary and secondary, with how and when each is measured.
• Data extraction. Who extracts, using what form, and how you resolve conflicts.
• Risk of bias. Name the tool. Say whether two reviewers will assess independently.
• Analysis plan. How you’ll pool data, which effect measures you’ll use, and your approach to heterogeneity, subgroups, and publication bias.
• Funding. The source, or a clear statement that the review is unfunded.
• Conflicts of interest. Declare them, or state that there are none.

Step 4: Review your application

Go back through every field. Do your outcomes match your objectives? Are the eligibility criteria the same in every section where they appear? Are your dates realistic? Vague answers are the usual reason a record comes back.

Step 5: Submit

The guarantor, normally the senior author, approves the record. Team members confirm their participation. Once those confirmations land, the registration goes in.

What Happens After Submission?

PROSPERO runs automatic checks while you type and may ask for more detail in certain fields. The record is then screened for eligibility and completeness. If something is unclear, you’ll get an email with questions. You edit the record and send it back. Timelines vary quite a bit, so leave room for anything from a few days to a few weeks.

When the record is accepted, it’s published and you get a protocol registration number. It looks something like CRD420261234567. Keep it somewhere safe. That number goes in your protocol paper, your final manuscript, and the journal submission form, because reviewers use it to check that you registered before you started rather than after.

Can You Make Changes After Registration?

Yes, and you should. Reviews rarely run exactly to plan, and PROSPERO is built with that in mind.

Small changes, like adding a database or pushing back your completion date, you just enter into the record. Bigger ones, like changing your primary outcome or your risk of bias tool, go in the same way, with a short note explaining why.

Every amendment after registration is date-stamped, and the earlier versions stay public. That trail is the point. Changing your plan doesn’t hurt your credibility. Hiding the change does. Mention any deviation in the methods section of your final paper too.

Common Reasons PROSPERO Registrations Are Rejected

Records get returned or turned down for a fairly predictable set of reasons:

• The review is finished, or data extraction has already started
• The methodology is missing, or too vague to reproduce
• The protocol is incomplete, sometimes with placeholder text still sitting in key fields
• The research question has no clear PICO structure
• A narrative, scoping, or literature review was submitted as a systematic review
• The team already registered the same review
• There’s no real systematic method behind it, such as a documented search or dual screening
• Eligibility criteria are missing, or they contradict something else in the form

Almost all of this is avoidable. Write the protocol before you open the form. Treat every field as something an outsider has to be able to follow. Register before screening, not after. And if your record does come back, fix the specific fields they flagged rather than rewriting everything.

Best Practices for a Successful PROSPERO Registration

• Register early, before screening or extraction begins
• Use PRISMA-P as your guide when writing the protocol
• Finish the protocol first, then transfer it across
• Check that objectives, outcomes, and eligibility criteria agree with each other
• Keep the record updated as work moves along
• Be open about amendments, in the register and in your manuscript

Frequently Asked Questions

Q1. Is PROSPERO registration free? 

It is. Registering and searching both cost nothing.

Q2. How long does it take? 

An hour or two to fill in the form if your protocol is ready. Acceptance takes anywhere from a few days to a few weeks.

Q3. Can I register after I’ve started? 

Up until data extraction begins, yes. After that, the review isn’t prospectively registered anymore.

Q4. Can students register a review? 

Yes, though reviews done for a class or training module should use the student project option. Those records are stored privately instead of published.

Q5. Does PROSPERO peer review my protocol? 

No. It checks eligibility and completeness. It doesn’t judge or endorse your methods.

Q6. What about a scoping review? 

Not eligible. Most people use Open Science Framework instead.

Q7. Someone already registered my topic. Now what?

 You can still go ahead. Just explain in your paper how your review differs, whether that’s the population, the timeframe, or the outcomes.

Final Thoughts

Registration is easy once the protocol is done properly. The form only feels hard when the methods behind it are still unsettled. Sort out your question, your criteria, and your analysis plan first, and the rest is mostly copying and pasting. Register early, stay open about changes, and every stage that comes after gets simpler.

Ready to start your first systematic review?

The American Academy of Research and Academics works with medical students, residents, and early-career researchers taking a project from first idea to publication. Our mentors help you frame a workable PICO question, build a search strategy that holds up, write a PRISMA-P compliant protocol, and get your PROSPERO registration right the first time. Reach out to the American Academy of Research and Academics and take the first real step toward a published systematic review.

Disclaimer:

Articles published by American Academy of Research & Academics are prepared by our team using information from direct experience, publicly available resources, and educational references. AI tools may be used to assist with drafting, proofreading, and formatting; however, all content undergoes review and approval before publication.
The information provided is intended for educational purposes only. Requirements, policies, and processes may change over time. Readers should consult official sources for the most current information.