PANS and PANDAS are clinical diagnoses, meaning a provider arrives at them based on the full picture — the onset timeline, the specific symptoms present, and ruling out other explanations — not from a single test that comes back positive. There is no one blood test that confirms these conditions. For PANDAS specifically, providers look for a connection between symptom onset and a strep infection, but standard strep tests miss a meaningful number of infections. Rapid strep tests are not as reliable as many parents assume, and the antibody tests used to detect recent strep also have documented limitations. Normal test results do not rule out PANS or PANDAS. If your child's presentation fits the clinical picture and you are not getting answers, seeking evaluation from a provider with specific PANS and PANDAS experience is a reasonable next step.