Field Guide · First Questions
The hardest surprise for most parents: there is no single blood test that says “PANS.” The diagnosis is clinical — made from the story and the symptom pattern. Labs aren’t there to confirm PANS; they’re there to find the trigger and rule out other things. Here is the workup, what each test is for, and how to start ordering it.
I walked this part of the labyrinth myself — knocked on the doors, read the research, and came back with the map. You don’t have to find the way out alone.
PANS is a clinical diagnosis. It rests on the history — the abrupt onset of OCD or food restriction, plus the cluster of symptoms — not on a lab number. That means the timeline you write down (when it started, what you saw) is as diagnostic as anything in the blood. Labs come in to identify the trigger (strep, another infection, an immune problem) and to rule out other explanations. Don’t wait for a test to “prove” PANS — that test doesn’t exist.
These are the labs most PANS-literate clinicians want early. None of them alone diagnoses PANS — together they map the trigger and the terrain.
| Test | What it’s for |
|---|---|
| Throat swab + strep titers ASO, anti-DNase B | The classic trigger. A swab catches active strep; titers catch a recent infection even without a sore throat. Trending them over time can show immune activity. |
| Mycoplasma IgM + IgG + PCR | A common, easily-missed PANS trigger. The full picture needs more than a single IgG — ask for IgM and PCR too. |
| Vitamin D + full thyroid | Low vitamin D is common and worth correcting; thyroid problems can mimic or worsen the picture. Foundational, cheap, fixable. |
| Immune & inflammatory baseline CBC, immunoglobulins, ANA, ESR/CRP | Looks for immune dysregulation and a tendency to autoimmunity — the engine behind PANS. |
| Copper + ceruloplasmin | A piece of the methylation and metals picture that conventional workups routinely skip. |
| Infection trigger pair tick-borne + viral as indicated | When strep isn’t the story, look wider: tick-borne infections (Lyme and co-infections) and viruses (EBV, HHV-6, Coxsackie) are real triggers. |
This is a starting map drawn from the PANS consensus workup, not a prescription. Which tests are worth it depends on your child’s specific picture — the goal is to test smartly, not to run everything.
You don’t need a specialist just to order the foundational bloods. There are three paths:
Specialized infection panels (tick-borne, some viral) are usually ordered through a clinician who knows how to read them — the labs that catch these are not the standard ones, and they’re easy to under-order.
It is common — and not a reason to give up. Many excellent pediatricians weren’t taught PANS, because it sits in the cracks between neurology, immunology, infectious disease, and psychiatry. If you hit a wall:
Bring the written timeline and the PANS criteria, ask specifically for the strep swab and titers, and if you’re dismissed, seek a PANS-literate clinician — pediatrician, psychiatrist, neurologist, immunologist, or integrative doctor. The right knowledge matters more than the specialty label. You are allowed to keep looking until someone listens.
Not sure which tests your child actually needs? Plan B reads your child’s history and symptoms and tells you exactly which labs are worth running for your child — and drafts the list and the doctor letter for you, so you never waste money chasing the wrong thing. Your first Synthesis is free.
Start your free Synthesis → Parent education, not medical advice. You stay in charge.PANS is diagnosed clinically, not by a single test. Write down the timeline, start the foundational workup — strep swab and titers, Mycoplasma, vitamin D, thyroid, an immune baseline — and widen the search for the trigger when strep isn’t the story. You can begin many of these yourself, and if your doctor hasn’t heard of PANS, keep looking for one who has. Test smartly, not exhaustively. This is parent education, not medical advice — bring it to your team as questions.
Plan B does not partner with drug companies or doctors, and we never endorse anyone whose healing isn’t verified by families. We show you the options and how to vet them yourself — and we’re building parent verification: look up a practitioner and see real family reviews before you trust them. Universal bad reviews? Skip.