Comprehensive Evidence Synthesis Services
Evidence synthesis is the systematic process of combining findings from multiple primary studies to generate new knowledge, inform clinical decisions, and guide policy. It encompasses a family of review methodologies, each designed for specific research contexts and questions.
At Research Gold, our evidence synthesis service covers every major review type. Whether you need an umbrella review for a clinical guideline, a rapid review for a policy brief, or a narrative review to contextualize your primary research, our PhD methodologists deliver rigorous, publication-ready work following established methodological frameworks.
Review Types We Offer
Systematic Review
Our flagship service. A systematic review follows Cochrane Handbook methodology (Higgins et al., 2023) with PRISMA 2020 reporting (Page et al., 2021). Includes protocol development, comprehensive search, dual-reviewer screening, risk of bias assessment, and narrative or quantitative synthesis. Starting from $895.
Learn more about our systematic review service
Meta-Analysis
Quantitative pooling of effect sizes using R or Stata. Includes forest plots, funnel plots, heterogeneity assessment, subgroup analyses, meta-regression, GRADE tables, and fully reproducible code. Available standalone or bundled with a systematic review. Starting from $825.
Learn more about our meta-analysis service
Scoping Review
Evidence mapping using JBI methodology and PRISMA-ScR guidelines (Tricco et al., 2018). Ideal for exploring broad topics, identifying evidence gaps, and informing future research priorities. Starting from $725.
Learn more about our scoping review service
Umbrella Review
An umbrella review (also known as a review of reviews) synthesizes the findings of multiple systematic reviews on a related topic. It provides a high-level overview of the evidence landscape and is commonly used for clinical guidelines and health technology assessments. We follow the JBI methodology for umbrella reviews and apply AMSTAR 2 to assess the quality of included reviews.
Rapid Review
A rapid review uses streamlined systematic review methods to deliver findings within a compressed timeline, typically 2-4 weeks. It may use simplified search strategies, single-reviewer screening, or narrative synthesis instead of meta-analysis. Rapid reviews are commonly requested for policy decisions, organizational planning, and time-sensitive clinical questions.
Narrative Review
A narrative review provides a comprehensive, qualitative summary of the literature on a topic without the strict systematic methodology of a systematic review. While less rigorous for answering specific clinical questions, narrative reviews are valuable for introducing a topic, providing context in a discussion section, or supporting editorial commentary.
Living Systematic Review
A living systematic review is continually updated as new evidence becomes available. It is particularly valuable for rapidly evolving fields such as infectious disease, pharmacology, and clinical trial evidence. We can set up the initial review infrastructure and provide periodic updates on an agreed schedule.
Pricing Overview
| Service | Starting Price | Typical Timeline |
|---|---|---|
| Systematic Review | $895 | 1-5 weeks |
| Scoping Review | $725 | 1-5 weeks |
| Meta-Analysis (standalone) | $825 | 1-5 weeks |
| Systematic Review + Meta-Analysis Bundle | $1,500 | 1-5 weeks |
| Umbrella Review | Custom quote | 3-6 weeks |
| Rapid Review | Custom quote | 2-4 weeks |
| Narrative Review | Custom quote | 1-3 weeks |
| Living Systematic Review (setup) | Custom quote | Varies |
All standard services include unlimited revisions. Visit our pricing page or get a free quote.
How to Choose the Right Review Type
| Question | Best Review Type |
|---|---|
| What is the treatment effect of intervention X? | Systematic review + meta-analysis |
| What evidence exists on topic X? | Scoping review |
| What do existing systematic reviews say about X? | Umbrella review |
| I need evidence synthesis in 2-3 weeks | Rapid review |
| I need a broad introduction to a field | Narrative review |
| Evidence is changing rapidly | Living systematic review |
Not sure which review type is right? Get a free quote and our team will recommend the best approach for your research question.
Our Methodology Standards
Every evidence synthesis we produce adheres to the highest methodological standards:
- Cochrane Handbook (Higgins et al., 2023) for systematic reviews
- PRISMA 2020 (Page et al., 2021) for systematic review reporting
- JBI Manual for Evidence Synthesis (Aromataris and Munn, 2020) for scoping and umbrella reviews
- PRISMA-ScR (Tricco et al., 2018) for scoping review reporting
- GRADE framework for certainty of evidence assessment
- AMSTAR 2 for methodological quality assessment of included reviews
Explore our free evidence synthesis tools: PRISMA flow diagram generator, effect size calculator, and GRADE evidence certainty tool.
Testimonials
"We needed an umbrella review covering 14 systematic reviews for our clinical guideline update. Research Gold's team synthesized everything into a clear, actionable summary with GRADE-rated recommendations. The guideline committee accepted it without revisions."
Verified Client, Professor of Nursing Science
Get Started
Describe your project and receive a personalized recommendation and quote within 2 hours. Get a free quote or explore our individual service pages:
- Systematic review service
- Meta-analysis service
- Scoping review service
- Response to peer reviewers
- Medical manuscript writing
- Biostatistics consulting
View our transparent pricing for standard services.