Digital forms replace paper in healthcare. Adoption depends on five design levers.
1. Form length + time visibility. <10 min + estimate → 60-70% completion. >20 min → drops to <30%.
2. Pre-population from FHIR resources. Known data pulled from FHIR store. +15-20 pp completion.
3. Mobile-first rendering. 60%+ mobile completions. Renderer must work at 375px.
4. Save-and-resume via status: in-progress. Long forms need progressive save.
5. Terminology binding pre-computed. Cached ValueSet expansions. Prevents runtime $expand latency.
Completion impact
| Lever | Impact |
|---|---|
| Time estimate | Baseline |
| Pre-population | +15-20 pp |
| Mobile-first | +10-15 pp |
| Save-resume | +10 pp long forms |
| Cached terminology | +5 pp |
Renderer selection
| Renderer | All levers | Mobile UX |
|---|---|---|
| Aidbox Formbox | Yes | Excellent |
| LHC-Forms | Yes | Good |
| Smile CDR SDC | Yes | Good |
| Custom HTML | Depends | Depends |
Deployment metrics
| Metric | Target |
|---|---|
| Completion rate | >70% |
| Time-to-complete | <10 min |
| Mobile completion | >65% |
| Save-resume usage | 15-30% |
Common mistakes
1. No time estimate. 2. No pre-population. 3. Desktop-first UX. 4. No save-resume. 5. Runtime $expand.
Digital forms deliver value proportional to design quality. Sites investing in the five levers ship high completion rates.