Pediatric intake forms ask more of a FHIR Questionnaire engine than almost any other use case in US ambulatory care. The age-aware branching, the developmental milestone screeners, the growth chart calculations, the immunization history validation against the CDC schedule, the parent-as-respondent dynamic, and the dual-language requirement for many regions all stack up at once. An engine that handles them gracefully saves a pediatric practice hours per day. An engine that does not turns intake into a back-office mess.
This list covers five FHIR Questionnaire engines that hold up in a real pediatric intake workflow in 2026. For the FHIR fundamentals hub, the related comparisons cover the broader form-builder landscape.
What Pediatric Intake Adds to the Stack
Pediatric intake is a Questionnaire engine stress test on six dimensions at once. The form has to branch by age band, often down to the month for infants. The branching has to handle multi-respondent flows where the parent answers most items but a teenager answers some. The growth chart calculations need calculatedExpression that handles percentile lookups. The immunization history needs validation against the CDC schedule, ideally via a SNOMED CT or CVX-coded value set. The developmental screeners need scoring logic baked into the form. And the whole thing needs to render in English and Spanish at minimum.
For the underlying form-engine capability checklist, the medical form builders buyer's guide is the right starting point.
The 5 Questionnaire Engines to Know
LHC-Forms is the open-source NLM-maintained engine with the most complete SDC implementation in the field. The full enableWhen and calculatedExpression support handle age-band branching and growth chart percentile calculations cleanly. The downside is that the practice owns deployment, themeing, and Spanish translation work.
Aidbox Forms is the SDC engine bundled with the Aidbox FHIR platform. The runtime value set resolution makes the CDC immunization schedule check straightforward, and the QuestionnaireResponse extraction layer handles the growth chart Observations without custom code. Cost is the trade-off, especially for smaller pediatric practices.
Smile Digital Health Forms ships with the Smile FHIR platform. Their handling of multi-respondent flows is good, the operational maturity matters when a pediatric practice scales across multiple sites, and the support contract reduces the time a head of clinical informatics spends on form troubleshooting.
Open Health Hub Forms is built around patient-administered surveys, which fits the parent-as-respondent pattern. The engine handles long-form developmental screeners with score calculation reasonably well. The trade-off is narrower SDC coverage than the NLM line.
Pathways pairs a Questionnaire engine with Ontoserver for tight terminology binding. For a pediatric practice that needs the immunization value set to stay in sync with CDC updates without redeploying, Pathways has a clean story. The product is on the heavier operational side.
Targeted Tests for a Pediatric Intake Workflow
A few specific tests will tell you whether an engine survives a real pediatric setting.
- Render the form for a 6-month-old, a 4-year-old, and a 14-year-old, and verify the branching produces the right items for each age band.
- Plot a growth chart calculation across ten visits and verify the percentile output matches the WHO and CDC reference curves.
- Run the CDC immunization schedule check against a child with three missed vaccines and verify the flagged items match the schedule for that age.
- Walk through the form in Spanish with a native-speaking reviewer and confirm the medical terms read correctly, not just literally translated.
Engines that pass those four are safe to put in a pediatric pilot. Engines that fail any of them produce intake forms that staff will work around within a month.
How to Pick
For deep SDC coverage with full control, LHC-Forms is the right pick. For tight terminology binding and clean clinical-store integration, Aidbox Forms or Pathways come out ahead. Smile fits multi-site pediatric groups. Open Health Hub Forms fits parent-administered surveys specifically. The companion read is the Top 5 SDC renderers for tablet-based bedside workflows, which covers the device side of the same problem.
Sources
- PHQ-9 Questionnaire example in US Core - HTML example, HL7 US Realm SC, 2025
- SDC Form Data Extraction - HTML spec, HL7 FHIR Infrastructure WG, 2025
- LHC-Forms project documentation - HTML docs, NLM Lister Hill Center