Questions
A clean answer to each. Tap Want more detail? on the longer ones to go deeper.
Most people answer this with “the 15-minute visit.” We thought that too, for a long time.
But the same diagnostic breakdowns show up in the ICU and the ER — where time isn't the constraint. So it was never really about the minutes.
What's actually happening is structural. A medical visit has to do three different things at once — pull your story together, talk like people, and make a plan — and each one has its own way of breaking. TerrainDx works on the structure of how diagnoses get made, not the length of the visit.
Your doctor is working from what you remember in the moment, what's in your chart, and what they can pull up in time. Things get left out — not because anyone's careless, but because memory under stress is partial. TerrainDx organizes what you'd want them to know before you arrive: your story in your own words, the chronology a diary makes visible, the small details that change the picture, the things you'd forget to mention if nobody reminded you. Better input, better diagnosis — the same rule that applies to every AI tool, too.
The visit has to carry both human connection — which builds trust and is part of why doctors are doctors — and problem-solving, which makes the diagnosis. Both matter; neither shrinks. TerrainDx pulls the “what about my XYZ” worries onto the page beforehand, so when you arrive, you've already been heard. There's room left for the diagnostic work. The visit gets focused. You don't feel cut off; the doctor doesn't feel pulled away.
A good plan covers the dangerous tail (what to watch for if this turns out to be the rare scary thing), confirms you understand it, and doesn't lose the threads that aren't resolved today. Most patients leave a visit and forget half of it within an hour. The map persists. You take it home; the what-ifs are framed; your specialist and your primary-care doctor share the same picture; the next visit doesn't have to re-litigate what was already ruled in or out.
A tool that organizes what's going on with your health into a map — the full picture of what your doctor would actually consider, in proportion. It's not a diagnosis; it's preparation.
Most diagnostic AI tries to do one thing well: name the most likely answer. TerrainDx is built to do five things at once, which no other patient or physician tool does today:
1. Gives your doctor time back, by organizing your story before you walk in.
2. Surfaces the missing data and quiet outliers — the easy-to-overlook details that actually change what's being considered.
3. Helps you understand what your doctor is weighing — and why their judgment is the thing that matters.
4. Holds the full picture — the secondary and tail possibilities — and carries it, evolving, from visit to visit instead of resetting each time.
5. Reduces diagnostic error.
It can do all five because it maps the entire landscape of possibility and shares it between you and your doctor — instead of collapsing everything into a single best guess.
Search ranks by what's popular — so the scariest thing tends to come up first. TerrainDx organizes the picture the way a doctor would: the everyday possibilities alongside the serious ones, in proportion, with the signs that would make each more or less likely. And your doctor can read the same map.
Because that's how diagnosis actually works. A short ranked list feels reassuring but hides what's been left off. The full landscape is the honest version: the common explanations on one side, the rare-but-watch-it ones marked, and the questions that would shift the picture either way. Concerning diagnoses are rare, and seeing the whole picture makes that visible.
Your guide through the map — a friendly park-ranger character who walks you through what each section means and points out the questions worth raising with your doctor. He's there to help you make sense of what you're looking at, in plain language.
A few minutes to enter your story. The full picture takes 10–20 minutes to come together.
A panel of specialty-trained tools works through your case the way a multidisciplinary team would — each looking at it through a different lens, then the views get reconciled. The smart move is to enter your case before your appointment so the map is ready when you arrive.
There's nothing to download. TerrainDx runs in any web browser — open patient.terraindx.co on your phone, tablet, or computer and you're in. Your doctor doesn't need to install anything to view a map you share with them either.
It's designed to do the opposite. The full picture lets your worst fear sit in proportion against the everyday possibilities. Concerning diagnoses are rare — seeing what's actually on the table tends to make people feel less in the dark, not more.
Yes — for yourself or for someone you love. Same site, same map. People often build a case for a parent bouncing between specialists, or for a friend whose health has been unexplained for a while.
Yes. The diary lets you log how symptoms evolve — small entries over time build a richer story, useful for your next appointment and for re-running your map if something changes.
This works especially well for chronic and recurring symptoms — which is exactly the territory where short ranked lists tend to flatten. The diary keeps the longitudinal thread that doesn't fit anywhere in a standard medical record.
Especially well. These are exactly the cases where the full landscape helps most — where the answer is rarely a single obvious thing and where the picture evolves over time. The map updates as you add information.
No. TerrainDx helps you prepare for the conversation with your doctor, not replace it. If you're experiencing a medical emergency, call 911.
Most are, once they see the format. It's not a “second opinion” or a critique — it's a structured version of the history they'd want anyway, plus a picture of what's being considered. It doesn't take their time; it adds to what they have to work with.
The same map you see, viewable in any browser — no login, no install, no cost to them. They see your story in your own words, the organized picture of possibilities, and the questions that would shift things either way. The clinical context is up front and the reasoning behind every possibility is traceable.
Bring it to your appointment on your phone. Reading the map together, even briefly, is one of the most useful things you can do — it gives the doctor a head start without any prep on their end. You can also print a clean summary and hand it over.
Pricing details and beta access information are available on request via our contact form.
FSA/HSA eligibility for digital health-information tools depends on your administrator's policies; ask whether decision-support tools that prepare you for clinical visits are reimbursable under your plan. We're happy to provide documentation on request.
TerrainDx is in select beta — we're onboarding a small group of patients to refine the experience before broader release. Send a note via our contact form to be considered for the next cohort. We read and reply to every one.
Tell your story in your own words: symptoms, when they started, what they feel like, what you've tried, anything your doctor has said so far.
You should NOT include your real name, date of birth, Social Security number, or insurance information — we don't need them and you shouldn't enter them. If you want to share with your doctor, the secure link does the introduction; you don't need to identify yourself in the case text.
Your map is yours. We use industry-standard encryption in transit and at rest. Nothing is shared with anyone — including your doctor — until you tap to share. We never sell information.
Your map is a personal health record under your control; for many use cases this means you can share with anyone you choose, anytime, without HIPAA business-associate requirements applying to us. If you have specific questions about HIPAA coverage for your situation, ask us via our contact form.
Age: TerrainDx is intended for adults. We recommend any educational use with teenagers be done in a collaborative setting with a parent or guardian.
Yes. Every map can be exported as a structured summary (the same one you share with your doctor) or printed as a clean PDF. If you cancel a subscription, your maps stay as printable views you can keep — they don't disappear.
Yes — at any time, from your account settings. When you delete, we don't keep copies. If you want to delete your entire account, we'll honor that within a reasonable processing window. To exercise these rights, use our contact form.
We answer every note.
Get in touchTerrainDx is an information tool designed to help you prepare for medical care. It does not diagnose, treat, cure, or prevent any disease or condition. Always discuss symptoms and decisions with a licensed clinician.