Voice Outcome Survey
Also known as: VOS
The Voice Outcome Survey (VOS), also known as the Voice Handicap Index (VHI), is a 30-item self-report questionnaire assessing the psychosocial, functional, and physical impact of voice disorders on quality of life. Developed by Jacobson and colleagues in 1997, the VOS/VHI has become the standard outcome measure in laryngology and voice pathology for quantifying voice-related disability, monitoring treatment response, and evaluating outcomes following voice therapy or laryngeal surgery.
Read the full method
Sign in with a free account to read this section.
Method map
The neighbourhood of related methods — select a node to explore.
When to use it
The VOS is used in otolaryngology, laryngology, and voice pathology clinics for patients with dysphonia from any etiology: vocal cord paralysis, vocal cord paresis, vocal cord dysfunction, voice tremor, laryngitis, laryngeal papillomatosis, vocal cord granuloma, and functional dysphonia (muscle tension). Valuable for baseline assessment, outcome measurement following voice therapy or laryngeal surgery (medialization, thyroplasty, vocal cord injection, laryngeal framework surgery), and evaluation of pharmacotherapy (botulinum toxin for spasmodic dysphonia). Standard in research evaluating voice interventions.
Strengths & limitations
- Multidimensional assessment capturing functional (occupational/social), physical (symptomatic), and emotional (psychological) impact of voice disorders
- Excellent reliability (test-retest intraclass correlation coefficient = 0.88) and internal consistency (Cronbach's α = 0.91)
- Extensively validated across diverse voice pathologies (neurologic, structural, functional)
- Strong sensitivity to change during voice therapy or post-surgical recovery; clinically meaningful improvement well-documented
- Practical 30-item format; brief 10-item short form (VHI-10) available for resource-limited settings
- Subscale pattern analysis useful for treatment planning: high Functional scores prioritize work-related voice improvement; high Physical scores focus on symptom reduction; high Emotional scores suggest concurrent mental health intervention
- Does not assess objective voice acoustics (fundamental frequency, jitter, shimmer); stroboscopic or acoustic analysis required for complete evaluation
- Emotional subscale overlaps with depression and anxiety screening; high Emotional subscale may reflect secondary mood disorder rather than voice disorder alone
- Does not capture occupational complexity; a professional singer's VOS from mild hoarseness may be higher than a non-voice professional's severe dysphonia
- Limited pediatric validation; primarily studied in adult voice populations
Frequently asked
What VOS score indicates need for laryngeal surgery?
VOS score alone does not determine surgical candidacy. Moderate-to-severe VOS (>60) combined with documented laryngeal pathology (cord paralysis, vocal cord paresis) on stroboscopy may warrant consideration of surgical intervention (medialization, thyroplasty, injection). However, voice therapy is typically first-line even in structural disease. Surgery is considered after adequate voice therapy trial (8–12 weeks) with insufficient improvement. Functional dysphonia typically should not undergo surgery.
How is VOS distinct from acoustic voice analysis or GRBAS perceptual rating?
VOS measures patient-perceived handicap and quality-of-life impact. GRBAS (perceptual scale rated by clinician) and acoustic analysis (computational measurement of frequency, jitter, shimmer) assess voice quality objectively. All three are complementary: a patient may have severe hoarseness (high GRBAS, abnormal jitter/shimmer) with low VOS if non-voice-dependent occupation, or mild perceived hoarseness (low GRBAS) with high VOS if professional singer. Comprehensive voice assessment includes all three.
What constitutes clinically meaningful VOS improvement?
A reduction of 8–10 points (or 10% of baseline score) indicates meaningful improvement. Most patients with significant voice disorder therapy benefit show 20–40 point reduction over 8–12 weeks. Failure to improve by ≥10 points after 8–12 weeks of voice therapy suggests diagnostic reconsideration (functional dysphonia misdiagnosed as neurologic; ongoing voice trauma from improper technique) or need for surgical intervention.
Can VOS be used in children with voice disorders?
The standard VOS was validated in adults. A pediatric version (Pediatric Voice Handicap Index, pVHI) adapted for children ages 6–11 years is available. For younger children (<6 years), parent-proxy rating or simple yes/no symptom questionnaires may be necessary. Age-appropriate instrument selection is important to ensure valid, reliable assessment.
Sources
- Jacobson, B. H., Johnson, A., Grywalski, C., Silbergleit, A., Jacobson, G., Benninger, M. S., & Newman, C. W. (1997). The Voice Handicap Index (VHI): Development and validation. Journal of Speech, Language, and Hearing Research, 40(5), 1139-1149. DOI: 10.1044/1058-0360.0603.66 ↗
How to cite this page
ScholarGate. (2026, June 3). Voice Outcome Survey. ScholarGate. https://scholargate.app/en/otolaryngology/voice-outcome-survey
Which method?
Set this method beside its closest kin and read them side by side — the library lays the books on the table; the choice is yours.
- Voice Handicap IndexSpeech Language Pathology↔ compare