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Dysphagia

Dysphagia Outcome and Severity Scale (DOSS) calculator

Ordinal 1-7 clinician rating of dysphagia severity that combines diet, independence, supervision, and nutrition route into a single grade.

Current DOSS severity level

DOSS level

Select a level

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Pick the level that best matches the patient's observed swallow function.

About the DOSS

The Dysphagia Outcome and Severity Scale was developed by O’Neil, Purdy, Falk, and Gallo at the Mayo Clinic and published in Dysphagia in 1999. It was designed to provide a single, globally interpretable severity grade that captured more of the clinical picture than diet alone — specifically, it rolls up modifications to diet texture, the amount of supervision and assistance the patient requires at meals, and whether the patient is nutritionally and hydrationally independent on oral intake or reliant on an alternative route.

The resulting seven-point ordinal rating runs from level 7, normal swallowing across consistencies and situations with no compensations, down to level 1, severe dysphagia with oral intake unsafe and nutrition and hydration delivered non-orally. The intermediate levels mark graduated increases in restriction and support: level 6 is within functional limits with self-directed compensations, level 5 is mild dysphagia with minimal supervision, level 4 is mild-to-moderate requiring some clinician supervision and one or two diet modifications, level 3 is moderate dysphagia with close supervision and two or more diet modifications, and level 2 is moderately severe dysphagia where oral intake is possible only with maximal assistance and strict modifications.

How to use it

Assign the single best-fitting level based on the combination of diet level, supervision, and nutrition route at the time of rating. If the patient straddles two levels, the lower (more severe) level is usually the safer conservative choice for documentation, particularly when supervision needs drive the decision. Because DOSS is a rollup, clinicians sometimes supplement it with FOIS (for diet detail) and PAS (for airway invasion detail) when more precision is needed for a given question.

Clinical context

DOSS is widely used in inpatient rehabilitation, acute care, and skilled nursing settings as a concise severity descriptor. It is particularly useful for discharge planning and for conveying the broader functional and supervision picture to multidisciplinary teams in a single number. In research, DOSS has been used as an outcome endpoint and correlates well with other measures of swallowing function.

Limitations

As an ordinal rollup, DOSS loses resolution — a single level can encompass quite different clinical profiles. For precise diet documentation pair with FOIS; for airway invasion pair with PAS; for patient-reported symptom burden pair with EAT-10. Averaging DOSS scores across time or patients is not meaningful because the scale is ordinal.

Primary source: O’Neil KH, Purdy M, Falk J, Gallo L. The Dysphagia Outcome and Severity Scale. Dysphagia. 1999;14(3):139-145.

Frequently asked questions

What does the DOSS measure?
The Dysphagia Outcome and Severity Scale is a clinician rating that combines diet level, independence, supervision needs, and nutrition route into a single ordinal severity grade from 1 (severe) to 7 (normal). It was developed at the Mayo Clinic by O'Neil and colleagues and published in Dysphagia in 1999.
When is DOSS the right tool?
DOSS is best when you need a single compact severity descriptor that captures more than just oral intake — it rolls up the supervision and assistance picture as well. It is commonly used in inpatient rehab, acute care discharge planning, and skilled-nursing documentation.
How is DOSS different from FOIS?
FOIS is narrower — it describes only current oral intake. DOSS combines diet, supervision, modifications, and route of nutrition. Many programs use both: FOIS for diet level, DOSS for overall severity.
Can I average DOSS scores?
No. DOSS is ordinal and the distance between levels is not equal. Report levels as a series over time and describe change qualitatively.
Does DOSS require instrumental assessment?
DOSS was originally developed in conjunction with videofluoroscopic findings, but in practice it is often assigned based on clinical swallow evaluation alone. When aspiration status matters, use DOSS alongside PAS and an instrumental study, not as a substitute for them.

See more dysphagia tools on the Dysphagia Suite hub.