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Instrumental swallow assessment: VFSS and FEES
VFSS shows all swallow phases on fluoroscopy, including the moment of aspiration, while FEES views the pharynx and larynx from above through the nose, without radiation and at the bedside, but goes "blind" at the exact moment of the swallow.
Why it matters in the exam
The classic question presents a patient and asks which study suits them: a ventilated patient or one who cannot get to fluoroscopy, a patient whose secretions need to be seen, a patient whose oral phase and bolus entry into the esophagus must be checked, or a child to be spared radiation. The differences between the two studies are the heart of the question.
Candidates are also asked about the 8-point Penetration-Aspiration Scale, where 1 is no entry, 2–5 are penetration and 6–8 are aspiration, with 8 being aspiration and no effort to eject the material. You should also describe when aspiration happened: before, during or after the swallow, because each timing points to a different mechanism and treatment.
Key points
- VFSS sees every phase and the moment of aspiration, with radiation.
- FEES is radiation-free and bedside, shows secretions and anatomy, but not the moment of the swallow.
- Penetration-Aspiration Scale: 1 normal, 2–5 penetration, 6–8 aspiration, 8 silent aspiration.
- The timing of aspiration matters: before, during or after the swallow.
- Choose the study by what you need to see and by the patient's condition.
Summary table
| Item | VFSS (videofluoroscopy, MBS) | FEES (endoscopic study) |
|---|---|---|
| What it shows | All phases: oral, pharyngeal, laryngeal and a view of the esophagus | The pharynx and larynx from above, before and after the swallow |
| Moment of the swallow | Aspiration during the swallow is seen | A "white-out" when the image disappears; aspiration during the swallow is inferred from residue |
| Advantages | Shows hyoid movement, UES opening and the oral phase | No radiation, bedside, repeatable, shows secretions, anatomy and sensation, and suits visual biofeedback |
| Disadvantages | Radiation, need to travel and sit, barium food | Nasal discomfort, no information on the oral phase or esophagus, blind at the swallow |
| Especially suited to | Suspected oral-phase or UES-opening problems, planning manoeuvres | Ventilated or bed-bound patients, heavy secretions, vocal fold paralysis, need for repeat studies |
In the full version for subscribers
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Sources
- ASHA Practice Portal, 2024 — Adult Dysphagia
- Rosenbek et al., Dysphagia (journal), 1996 — A Penetration-Aspiration Scale
- Langmore, Endoscopic Evaluation and Treatment of Swallowing Disorders, 2nd edition (2022) — Fiberoptic endoscopic evaluation of swallowing
Sources are given for further reading; the text is written afresh and not copied from them.
Reviewed by the Examqo AI Professor · 2026-11-02. The text may contain errors; when in doubt, check the source.