There is no single test that confirms PANS (Pediatric Acute-onset Neuropsychiatric Syndrome). Diagnosis relies on a combination of clinical criteria, lab work to identify possible triggers, and ruling out other conditions that look similar. The process can feel frustratingly indirect, but each piece of testing serves a specific purpose in building the full picture.
What Doctors Look for First
PANS is defined by three core requirements. First, a child must have an abrupt, dramatic onset of obsessive-compulsive disorder (OCD) or severely restricted food intake, with symptoms appearing in under 48 hours. The OCD must be severe and frequent enough to meet formal diagnostic thresholds. Second, the child must also show sudden neuropsychiatric symptoms in at least two of these categories: anxiety, emotional swings or depression, irritability or aggression, developmental regression, declining school performance, sensory or motor problems, and physical complaints like sleep disturbance or urinary issues. Third, other neurological conditions such as Sydenham chorea and Tourette syndrome must be ruled out.
Because onset speed is central to the diagnosis, one of the most important things you can bring to an appointment is a clear timeline. Parents who can pinpoint the week or even the day their child changed give clinicians critical information that no blood test can replace.
PANS vs. PANDAS
PANDAS is a subtype of PANS specifically tied to streptococcal infections like strep throat or scarlet fever. PANS is the broader category, which can be triggered by various infections, immune system dysfunction, or environmental factors. Both conditions affect children before puberty, typically between ages 3 and around 12. The testing approach differs slightly depending on which condition is suspected, but most clinicians screen for strep regardless since it’s the most well-documented trigger.
Strep-Related Blood Tests
Even if your child doesn’t have an obvious sore throat, strep screening is a standard first step. This usually starts with a rapid strep test and throat culture. If both come back negative, the doctor will check two antibody levels in the blood: ASO (antistreptolysin O) and Anti-DNase B. These antibodies rise after a strep infection, so elevated levels suggest a recent exposure even if the infection itself has already cleared.
Timing matters with these tests. ASO titers typically peak one to four weeks after the initial infection, while Anti-DNase B peaks later, around six to eight weeks. If a child is seen within a few days of symptom onset and has a negative throat culture, a useful strategy is to check baseline antibody levels and then retest six to eight weeks later. Doctors look for a two- to four-fold rise in titers between the two draws, which strongly suggests a recent strep infection was involved.
In some cases, a perianal strep swab may also be recommended, since strep can colonize areas beyond the throat.
Other Lab Work
Beyond strep screening, the recommended initial workup includes a complete blood count with differential, which helps identify signs of other active infections. A urinalysis is typically ordered when a child has urinary symptoms like sudden bedwetting or frequent urination, both to check hydration and rule out a urinary tract infection.
Depending on how severe the symptoms are and what the initial results show, additional testing may include:
- Immunoglobulin levels (IgG, IgA, IgM, IgE with IgG subclasses) to evaluate overall immune function and check for immune deficiencies that might make a child more vulnerable to recurrent infections
- Anti-nuclear antibodies (ANA) to screen for autoimmune conditions like lupus that could explain the symptoms
- ENT referral for evaluation of tonsils and adenoids, which can harbor chronic strep
- Swallowing studies for children with severely restricted eating, particularly when driven by fears of choking or vomiting
The Cunningham Panel
The Cunningham Panel is a specialized blood test that measures five markers associated with autoimmune activity in the brain. It checks antibody levels against the dopamine D1 receptor, dopamine D2L receptor, lysoganglioside GM1, and tubulin, along with a measure of CaM kinase II activation. Elevated results suggest that the immune system is producing antibodies that may be affecting brain function, which is the suspected mechanism behind PANS and PANDAS symptoms.
This panel is not universally accepted as a definitive diagnostic tool, and not all clinicians order it. Insurance coverage varies. But for families seeking additional evidence to support or clarify a diagnosis, it can provide useful data points, especially when other results are ambiguous.
Handwriting and Cognitive Clues
One surprisingly practical diagnostic tool involves handwriting. Dysgraphia, a sudden deterioration in handwriting ability, is a particularly useful feature of PANS because it’s easy to document. A handwriting sample taken during a flare can be compared against samples from when the child was well, creating visible before-and-after evidence. Some clinicians also ask children to copy a complex geometric design called the Rey-Osterrieth Complex Figure, which tests visual-spatial memory and motor coordination. Children with active PANS often score poorly on this kind of task.
If you suspect PANS, saving dated schoolwork and handwriting samples over time can give your child’s doctor a concrete way to track flares and correlate them with infections documented in the medical record.
Tracking Symptoms Over Time
Clinicians may use standardized symptom checklists to quantify how severe the OCD is. The Y-BOCS (Yale-Brown Obsessive Compulsive Scale) Symptom Checklist, for example, includes 67 types of obsessions and compulsions and helps establish a baseline severity score that can be monitored over time. This isn’t a one-time diagnostic test so much as a tracking tool, but initial scores help distinguish PANS-level OCD from milder, gradually developing OCD that would point toward a different diagnosis.
What Gets Ruled Out
Part of the PANS diagnostic process is eliminating other explanations. Conditions that can mimic PANS include Sydenham chorea (a movement disorder also triggered by strep), Tourette syndrome, autoimmune encephalitis, lupus affecting the brain, and thyroid disorders. The specific tests ordered to rule these out depend on the child’s symptoms. ANA testing, thyroid panels, and in some cases brain imaging or EEG may be part of this process.
This step can feel frustrating when you’re already convinced of the diagnosis, but ruling out conditions that require different treatment is essential. Some of these conditions are serious and treatable on their own, and catching them early matters.
Finding the Right Provider
PANS remains underrecognized by many general pediatricians, so families often need to seek out providers with specific experience. Pediatric neurologists, pediatric immunologists, and integrative medicine doctors who specialize in PANS tend to be the most familiar with the full testing protocol. The PANDAS Physicians Network maintains a directory of knowledgeable clinicians. Expect the diagnostic process to involve multiple appointments and potentially several rounds of lab work, especially if initial strep testing comes back negative and other triggers need to be investigated.