The design principle
Why these tools are built the way they are
There is a version of this tool suite that does not exist and will not exist: the one where you paste a lab PDF and receive a protocol. That product is already available from several directions. ChatGPT will do it. Various AI health tools will do it. And when clients discover this — and they are discovering it — they will wonder what they are paying a practitioner for.
The TDG suite is built from the opposite position. The tools surface patterns, flag connections, and prompt the clinical questions that the data is raising. They do not answer those questions. Because the answer to "what should this client do?" requires knowing who this client actually is — their 18-intake-form picture, their life context, what they will actually do at 6am on a Tuesday when the protocol meets reality. That is not automatable. It is the practitioner.
What AI tools give you
A list derived from the lab values
Scan the PDF, identify out-of-range markers, generate a supplement list and some dietary advice. Fast, plausible, increasingly available to clients directly. The output is the same whether the practitioner has seen one GI-MAP or a thousand. It does not know who is holding the results. It cannot sequence a protocol. It cannot course correct when the client's life derails the plan in week three.
What TDG tools give you
A faster, more systematic version of your own thinking
The analysers take what you already know and run it through a structured clinical lens — flagging the cross-test patterns that experience builds over years, surfacing the mechanism behind the finding, prompting the question the data is asking. The practitioner reads the output, applies it to the whole person they know from 18 intake forms, and makes the clinical call. That is the product. The tool makes you better at it. It does not replace it.
Why the 18 intake forms exist
Because a ferritin of 16 is not the same finding twice
A ferritin of 16 in a 39-year-old woman with heavy periods, a vegetarian diet, and three years of fatigue is a different clinical situation from a ferritin of 16 in a post-menopausal woman on a high-meat diet who has been training intensively. The result is identical. The context — what it means, what caused it, what to do about it, in what order — is entirely different. The 18 intake forms build the context before a single test is ordered. Without them, the analyser has numbers. With them, it has a person.
Why we have not automated test-to-protocol
Because the unique client needs a unique answer
The twists and turns of a six-month client-practitioner journey are never fully covered by any algorithm. When the protocol meets the client's actual Tuesday morning — the early school run, the meeting that ran late, the Friday night they went out anyway — the practitioner course-corrects. They find Plan B, and Plan C if needed. They encourage the client who missed a week rather than shame them. They find the win in the imperfect. That is not a failure of the protocol. That is the job. The TDG tools support practitioners who understand that. They are not built for practitioners who want the job to be simpler than it is.
The TDG practitioner proposition — stated plainly
If your clients can get the same answer from ChatGPT, what are they paying you for?
This is the question every practitioner in functional medicine needs to be able to answer — and the answer cannot be "I interpret the labs." Lab interpretation is increasingly commoditised. The answer has to be: "I know you. I know your context. I know what you will actually do, and what you will not. I know how to sequence these interventions so that the most important thing happens first and the rest follows when the foundation is solid. I know how to course-correct when your life gets in the way of the plan — because it will. And I know that the win is rarely the textbook version. The win is what actually moves you forward."
The TDG tools are built for practitioners who can give that answer. They are the fastest, most systematic way to get from raw test data to the clinical pattern — so that the practitioner's time and attention is spent on the part that only a practitioner can do. Not on manually cross-referencing 170 GI-MAP targets against the DUTCH and the blood chemistry. That is what the analyser does. What it cannot do is sit across from a client at 6pm when they are telling you why they cannot stick to the protocol, understand what they are actually saying, and know what to do about it.
The practitioners these tools are built for treat the investigation as investigation. They are health detectives. They are not looking for a system that hands them the answer. They are looking for a system that helps them find it faster — so they can spend more time on the work that is irreplaceable.
What practitioner access includes
The complete TDG Clinical Tool Suite
Every tool is a standalone HTML file in a password-protected directory. No app, no login latency. Works offline once loaded. Requires reading, applying, and thinking — by design.
18 intake forms · Context layer
Clinical intake — the foundation of interpretation
The test results are the answer to a question. The 18 intake forms are how you build the question correctly. Without this context, results are numbers. With it, they are a person's clinical picture.
New client health history — symptom timeline and severity mapping
Food log and dietary pattern analysis
Sleep quality and circadian assessment
Stress and HPA axis intake — life load and recovery capacity
Hormonal health intake — cycle history, HRT, contraceptive history
Gut symptom and history intake — bowel pattern, bloating, food reaction
Exercise and movement history — type, frequency, perceived exertion
Cognitive and mood intake — brain fog, anxiety, energy pattern
Medication and supplement review — interactions, timing, compliance
And 9 further intake forms covering toxin exposure, skin, thyroid, cardiac, autoimmune, paediatric, and re-assessment
32 analysers · Interpretation layer
Clinical analysers — pattern over number
Not reference ranges. Pattern identification, mechanism explanation, cross-test connection, and clinical priority sequence. The analysers do the systematic cross-referencing. You do the clinical application.
Blood Chemistry Analyser v3 — 65+ markers, 12 calculated ratios, functional ranges
Thyroid Conversion Pattern Tool — TSH, FT3, FT4, RT3, antibody pattern matrix
GI-MAP Pattern Differentiator — 4 dysbiosis classifications with priority sequence
Gut-Hormone Axis Analyser — beta-glucuronidase, oestrogen recirculation, 2:16 ratio
HPA Axis Stage Differentiator — CAR pattern, Stage 1–4 classification, intervention map
DUTCH Menopause Analyser — adrenal contribution, HRT monitoring framework
OAT Mitochondrial Pattern Tool — Krebs cycle, ETC, Candida, oxidative stress
HTMA Mineral Ratio Analyser — 8 key ratios including Na/K, Ca/Mg, Zn/Cu
Nutrition Integration Engine — 6-layer conflict resolution across all five tests
Master Practitioner Dashboard — all tests, all patterns, one clinical summary
And 22 further analysers covering neurodivergent patterns, cardiac risk, autoimmune, and more
Pattern library · Integration layer
Cross-test pattern identification — the most clinically valuable layer
Individual test interpretation is taught in most functional medicine training. Cross-test pattern recognition — knowing that the elevated beta-glucuronidase on GI-MAP explains the poor 2:16 ratio on DUTCH even when serum oestrogen is normal — is not. This is the layer that FDN, DUTCH training, and individual lab courses do not cover. The pattern library documents 25+ of these cross-test clinical patterns with mechanism, priority, and protocol sequence.
LPS → HPA → thyroid conversion cascade — the most common multi-system pattern
Oestrogen recirculation pattern — gut-DUTCH connection invisible to blood tests
Pregnenolone steal — cortisol:DHEA ratio cross-referencing DUTCH and blood
Mitochondrial fatigue pattern — OAT-blood connections across Krebs and ETC
Methylation-oestrogen connection — COMT, 2-MeOE1, homocysteine triangle
And 20+ further documented patterns with mechanism diagrams
48-marker library · Reference layer
Clinical marker library — expanding monthly from active cases
Blood, GI-MAP, DUTCH, OAT, and HTMA markers with functional reference ranges, biochemical mechanism, clinical priority for high and low findings, and cross-test connection for every marker. Built from real cases, not textbooks — which is why the clinical notes read differently from a standard lab reference.
48 markers across all five functional tests — expanding monthly
Functional ranges with clinical rationale — not just population-statistical normal
Clinical priority for elevated and depressed findings
Every marker connected to at least two other tests — the cross-reference is built in
Mechanism explanations that connect to the pattern library
Who these tools are built for — and who they are not
The TDG practitioner
FDN Practitioners and Nutritional Therapists
Built on the FDN DRESS protocol, Bill Wolcott metabolic typing, Bryan Walsh blood chemistry, and Reed Davis's healing opportunity framework. The TDG tools extend and systematise the functional testing approach you are already trained in — adding the cross-test integration layer that the training gives you the foundation for but not the tools to execute.
Naturopaths and Integrative Practitioners
For practitioners ordering GI-MAP, DUTCH, OAT, or blood chemistry who want structured interpretation tools that go beyond individual lab reference ranges to pattern identification across tests. The tools are designed for practitioners who already understand the fundamentals and need a faster, more systematic cross-test clinical layer.
Not for practitioners who want it done for them
These tools will not generate a protocol from a PDF upload. They will not tell you what to prescribe. If you are looking for a system that removes the need for clinical thinking, these are the wrong tools. They are for practitioners who know that clinical thinking is the job — and want a system that makes them substantially better at it.
"These tools exist because I built them for myself — and because the clinical thinking they encode took 37 years to develop. Every analyser started as a note from a real case: a result I didn't immediately understand, a cross-test pattern I needed to document, a protocol sequencing question I had to think through carefully. The TDG suite is that thinking, systematised. It does not replace the practitioner. It makes a practitioner significantly better — and that difference, for the client on the other side of the consultation, is what this is actually about."
Stephen Duncan · FDN-P · BSc Developmental Biology · MSc Coaching Studies & Applied Physiology · Detective Health Edinburgh
Access options
Practitioner subscription pricing
Full access to all tools, the pattern library, and the marker reference library. Cancel at any time — no minimum term.
Digital Products
Individual Guides
From £37
One-time purchase per guide
GI-MAP Interpretation Guide — £37
DUTCH Hormone Interpretation Guide — £37
Blood Chemistry Interpretation Guide — £37
OAT Interpretation Guide — £37
18 intake forms
32 interactive clinical analysers
Cross-test pattern library
Master Practitioner Dashboard
Practitioner Access
Full Clinical Tool Suite
£45
per month · cancel anytime
18 clinical intake forms — the context layer
32 interactive clinical analysers across all five tests
48-marker clinical reference library (expanding monthly)
Cross-test pattern library — 25+ documented patterns
Nutrition Integration Engine — 6-layer protocol
Master Practitioner Dashboard — all tests, one summary
Full clinical case studies with complete test data
Monthly updates built from active clinical cases
Currently in pre-launch — registering interest locks the £45/month founding member rate. Launch anticipated within 4–6 weeks.
Common questions
These tools don't generate protocols automatically — is that a limitation?
It is a design decision, not a limitation. A protocol generated from lab values without clinical context — who this person is, what they will actually do, what their life allows — is a list, not a clinical plan. The TDG tools build the clinical picture systematically so the practitioner can make an informed clinical decision. The goal is a practitioner who thinks faster and sees further, not one who is removed from the process. If the protocol could be generated automatically, the client would not need the practitioner.
What qualifications do I need?
No formal qualification requirement — the tools are built for any practitioner actively working with functional tests. FDN-P, registered nutritional therapists, naturopaths, and health coaches working alongside testing. Tools are interpretation aids — users are responsible for applying them within their scope of practice.
How do the tools work technically?
All tools are standalone HTML files in a password-protected directory on detective-health.com. They run in any modern browser — no installation required. Some tools use an AI interpretation layer via a Cloudflare Worker proxy; these require an internet connection. Reference and intake tools work fully offline once the page has loaded.
How is this different from FDN training or other functional medicine courses?
FDN and most functional medicine training teaches the individual tests — what each marker means in isolation. TDG tools provide the cross-test integration layer: what specific combinations of findings across multiple tests mean clinically, in what order to address them, and what the mechanism connecting them is. They are the practical clinical system that makes the training operational in day-to-day practice.
Can I cancel at any time?
Yes — monthly subscription, no minimum term. Access continues until end of the billing period.