REFERENCE · UNDERSTANDING DIAGNOSIS

Understanding a Positive FND Diagnosis

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources

For the Person With FND

A positive diagnosis means the clinician has identified features that support FND. The history and examination should fit together. A normal scan can answer an important question, but it does not itself identify FND. Other conditions can also occur alongside it. [1]

For functional leg weakness, a clinician may compare deliberate movement with an automatic contribution during another movement. Hoover’s sign is one example. The useful question is what the particular comparison showed in your examination, not simply whether you “passed” a test. [2]

Ask for an explanation you can return to: what supports the diagnosis, what remains uncertain, and what happens next. If a term is unfamiliar, ask for an everyday example. You do not need to remember the entire consultation to deserve a clear plan.

A finding that supports the diagnosis does not describe your whole day. How reliably you can wash, cook, walk, communicate or work requires its own discussion. See assessment and everyday function.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources

For Family, Friends, and Other Supporters

With permission, help write down the clinician’s explanation and the questions that remain. A person may want you to describe an episode they found difficult to recall. Give concrete observations without turning the appointment into a test of whether their account is believable.

Afterwards, ask whether they want to discuss the findings or need a break. Keep the agreed follow-up information available. Do not repeat diagnostic manoeuvres at home.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources

For Clinicians and the Care Team

Specify the positive feature, its suitability for the presentation and relevant confounders. Separate positive evidence from an unexplained symptom or unrevealing investigation. Explain coexistence and uncertainty rather than making the patient choose between mutually exclusive explanations. [1]

Document the observed finding separately from function and support needs. A diagnostic comparison is not an endurance or participation measure. For a GP, therapist or subsequent clinician, the useful handover includes what was actually observed, what has been assessed and the outstanding questions.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources

Research and Sources

The practical review supplies the broad diagnostic framework; the prospective Hoover study concerns a particular leg comparison in a suspected-stroke cohort. Neither source establishes that every variable symptom is functional or that a positive sign measures disability. This page introduces the reasoning; symptom and technique pages supply the specific application.

Citation	Figure	Full citation and scope
[1]	—	Bennett K, Diamond C, Hoeritzauer I, Gardiner P, McWhirter L, Carson A, Stone J. A practical review of functional neurological disorder (FND) for the general physician. Clinical Medicine. 2021;21(1):28–36. https://doi.org/10.7861/clinmed.2020-0987 FND-CIT-0001.
[2]	—	McWhirter L, Stone J, Sandercock P, Whiteley W. Hoover’s sign for the diagnosis of functional weakness: a prospective unblinded cohort study in patients with suspected stroke. Journal of Psychosomatic Research. 2011;71(6):384–386. https://doi.org/10.1016/j.jpsychores.2011.09.003 FND-CIT-0018.

For the Person With FND
For Family, Friends, and Other Supporters
For Clinicians and the Care Team
Research and Sources