REFERENCE · DIAGNOSTIC TECHNIQUE

Stuttering and Prosody Assessment

Clinician-focused educational reference. Assessment requires relevant training, consent and communication access. This is not a home diagnostic test.

Purpose and Suitability
Anatomy and Physiology
Preparation and Safety
Performing the Assessment
Interpreting Findings
Explaining the Result
Evidence and Limitations
Media and Accessibility
Research and Sources

Purpose and Suitability

Assess interruptions in speech flow or changes in rhythm, emphasis and intonation. Describe the pattern and history before assigning an aetiology.

Stuttering: Interruptions such as repeated sounds, prolonged sounds or blocks. Prosody: The timing, stress and pitch patterns that shape speech.

The clinician examines fluency, rhythm, stress and their consistency across tasks. Particular incongruities can contribute to diagnosis, but acquired neurological stuttering and developmental differences need assessment. No single stuttering pattern proves FND. [1][2]

Anatomy and Physiology

Fluency involves timing and coordination across speech processes; it is not simply the presence or absence of anxiety. Describe repetitions, prolongations and blocks separately from rate and intonation. This terminology does not specify an FND mechanism.

General fluency assessment considers the speaker’s history, speech samples and experienced impact, not only the number of audible interruptions. [3]

Preparation and Safety

Ask about earlier speech development, previous stuttering, usual languages, accent and recent changes. Agree meaningful speaking tasks and any recording. Offer time, breaks and alternatives to reading aloud when it is inaccessible.

Do not ask someone to imitate an accent, exaggerate a block or persist until speech becomes fluent. A familiar communication style, multilingual difference or emotional response should not be relabelled as a positive FND sign. These are clinical-description and accessibility safeguards.

Performing the Assessment

Obtain the onset and developmental history, including whether the pattern is new, recurrent or longstanding.
With consent, sample ordinary conversation and an appropriate structured task, using the cross-task sequence.
Describe where and how interruptions occur, their duration, speech rate, rhythm and accompanying effort. Record the person’s account alongside observable features.
Compare relevant tasks without assuming that a difference identifies the cause. Note language, familiarity, fatigue and task demand.
Integrate the findings with language, motor-speech and neurological assessment when indicated. Document what supports the formulation and what remains uncertain.

This is an educational documentation sequence, not a scored diagnostic instrument. Its FND interpretation follows the original inventory’s consensus and case-series sources. [1][2]

Singing versus speech

A clinician may compare comfortable singing and speaking where suitable. Different access to voice can be informative, but improvement with singing also occurs in non-functional disorders. This is a supportive comparison, not a specific diagnostic sign. [1]

Interpreting Findings

Potentially supportive: A specific incongruity may contribute to a positive formulation when interpreted by a clinician familiar with the differential.

Nonspecific: Fluctuation, visible struggle, a fluent passage or improvement with singing cannot alone identify FND.

Indeterminate: If language access, task suitability or the history is unclear, document that uncertainty and address it before assigning cause.

Do not classify an unfamiliar accent as inherently functional. Likewise, audible stuttering frequency is not a measure of how much the person participates or what speaking costs them. Ask about avoidance, time pressure, confidence and communication needs; do not assume those experiences are present in everyone.

Explaining the Result

Authored example:

“We have described the interruptions and rhythm changes, and compared them in tasks that are relevant to you. One fluent passage is not enough to explain the whole problem. I will explain which findings support the diagnosis and what still needs assessment.”

Use the person’s preferred terminology for their speech and check that the explanation answers their questions.

Evidence and Limitations

Chung and colleagues provide a six-case illustration, not a blinded diagnostic-accuracy study. The consensus recommendations guide formulation without establishing a single diagnostic stuttering pattern. [1][2]

The ASHA fluency resource is adjacent guidance: it explicitly excludes functional and acquired neurogenic fluency disorders. It supports attention to history, language and life impact here, not FND-specific accuracy or prognosis. [3]

Media and Accessibility

Prefer a labelled transcript paired with consensual audio when necessary. Describe blocks and pauses without ridicule or exaggerated narration. A transcript alone cannot capture every timing feature; audio alone is inaccessible to some readers. Provide both, avoid auto-play and distinguish a demonstration of method from an actual patient finding. No media is supplied.

Research and Sources

Citation	Full citation
[1]	Baker J, Barnett C, Cavalli L, et al. Management of functional communication, swallowing, cough and related disorders: consensus recommendations for speech and language therapy. Journal of Neurology, Neurosurgery & Psychiatry. 2021;92(10):1112–1125. FND-CIT-0025. https://doi.org/10.1136/jnnp-2021-326767
[2]	Chung DS, Wettroth C, Hallett M, Maurer CW. Functional Speech and Voice Disorders: Case Series and Literature Review. Movement disorders clinical practice. 2018;5(3):312-316. DOI. PMID: 30800702. FND-CIT-0169.
[3]	American Speech-Language-Hearing Association. Stuttering, Cluttering, and Fluency. Practice Portal. Accessed October 2, 2026. Professional guidance. FND-CIT-0247.